Novel Cover for WWII Historical Fiction
Book Cover: Mystery Series
Novel Cover for Historical Surrealist Novel
YA Novel Cover Design
Book Cover: Punk Thriller
Book Cover: Epic Fantasy
Non-Fiction book about chess
Book Cover: Sci-fi Novel
Novel Thriller Mystery
Book Cover: Historical Novel
Novel: Sophisticated Mystery


I no longer participate in 99D contests or contracts. I'm currently booked 1-3 months in advance through my website: www.mariahsinclair.com Please contact me there if you are interested in working together.

Country: United States. Member since: June 21, 2012
Contests won
Runner up
1-to-1 Projects
Repeat clients
Brand guide
Top Level




"Mariah did an excellent job of creating a full book cover that we can be proud of!"
Anonymous client
"Mariah goes above and beyond what is required to deliver a world-class product and service."
Profile pictureProf Bruce
"MuseMariah is awesomely talented. Better yet, she takes initiative to better understand what her clients are doing then she finds clever ways to make the project even better..."
Profile pictureProf Bruce
"Fourth job with Mariah. She's great! Very professional and patient, as well as creative, of course!"
Profile pictureEndpapers Press
"This is the third cover that Mariah has done for my small press and she has been professional and patient on each on. Looking forward to working with her more."
Profile pictureEndpapers Press
"This is the second time we have worked with MuseMariah and again she was efficient and quick to respond with changes/alterations."
Profile pictureemma.heinz
"A real pro. Very communicative. Very patient."
Profile pictureEndpapers Press
"Awesome experience. Mariah was very patient with me and produced a great cover. Highly recommend!"
Profile picturejayzR
"I think Mariah went above and beyond. Very professional. Invested in a font just to make the design work. We liked her design so much, we'll be using her on the next three books in the series!"
Profile pictureEndpapers Press
"MuseMariah nailed not only nailed our cover brief but has been a pleasure to deal with . Quick to respond and forthcoming with edits we look forward to working with her again!"
Profile pictureemma.heinz
"Amazing work and vision in her Art!"
Profile pictureHanadofo
"It was a long process (my fault) but worth every minute. Mariah is an artist's artist. Exceptional!"
Profile pictureewarner
"She was really easy to work with and was very helpful throughout the process. I will happily work with her again."
Profile picturejillfbrown
"Excellent work and experience. I would definitely work with this artist again and 99 Designs too."
Profile pictureProf Bruce
"Mariah is an attentive and thoughtful designer. She listened closely to my marketing and business objectives and made sure that these requirements were reflected in her design. I will be using her skills again and I highly recommend her."
Profile picturelisacabrelli
"I only need one word to describe MuseMariah - AWESOME!"
Profile picturerlprendergast
"Mariah was phenomenal throughout the entire process! She created an awesome design that is adaptable for an entire series of books, found stock imagery that captured the characters, and fine-tuned her design based on my requests. She is incredibly respo..."
Profile picturejet98012
"We had great communication and MuseMariah was able to capture the grittiness of my work in an eye-catching design. I am very happy to work with her and she will be doing my next cover!"
Profile pictureSanjuro
"She was easy to work with, responsive, and came up with by the best design in the contest, where 170 designs were submitted. Would definitely recommend."
Anonymous client
"Do yourself a favor and work with Mariah. She has a natural eye for design, layout, theme, and colors. I was not the easiest client to work for and asked a lot. She helped me work through a few different versions of my book cover (color, background chan..."
Profile picturedavelundy.author
"MuseMariah was absolutely fabulous to work with. She stood out as the talented artist that actually listened to me and gave insightful advice, tweaking and working with the project until it was something I loved. She stayed on top of it with such a plea..."
Profile pictureklrwrites
"I had a vague idea of what I wanted for my fantasy novel book cover and she blew me away! From her first submission I knew that her cover would be the winner. Her work is colorful, detailed and EPIC! Thanks again!"
Profile picturebrycespqr
"MuseMariah went above and beyond with her design for my book cover. She has a fantastic eye for design and color. Throughout the process, she was communicative and responsive. Highly professional and highly recommended. Excellent work."
Profile picturefreedomlancellc
"Needs more than five stars! MuseMariah did an amazing design and managed to combine a pic of the morgue with a chick-lit feel in a the exact way I was looking for. Not to mention that she was incredibly helpful from the beginning of the contest until t..."
Profile picturekitsergeant
"MuseMariah is an outstanding designer who went above and beyond the requirements described in my brief. She created a book cover design for our company that was beautiful, professional and impactful -- and exceeded our expectations."
Anonymous client
"A pleasure to work with. Very talented. I'd recommend her to anyone."
Profile picturejax1art