Griz and Norm are married animators/artists who work for Dreamworks Animation as a VizDev artist, and at Disney Feature Animation as a storyboard artist. They post their personal work and tutorials at: http://grizandnorm.tumblr.com/
Wannabe Animator is a great artist and friend of mine. She’s been relentlessly pursuing a career in animation as long as I’ve known her and posts great news, inspiration, and education having to do with animation and art. She’s also contributed to Animation Force from time to time as Jinny. Find her at: http://wannabeanimator.tumblr.com/ She also posts here personal art here: http://jinn-y.tumblr.com/
Modmad is an artist from the UK, who is a bit crazy. But she is also a crazy talented artist, and I’m always inspired by her work, both on her tumblr: http://modmad.tumblr.com/ and also on her ongoing webcomic called The Property of Hate, involving an object head character. Very inspiring draftsmanship: http://tpoh.smackjeeves.com/
Chris Battle is an American animation character design artist, best known for his work on the hit Cartoon Network shows DEXTER’S LABORATORY, POWERPUFF GIRLS, and SAMURAI JACK, as well as shows for Disney, Nickelodeon, Warner Bros, and more. He posts goofy stuff as well as animation stuff here: http://chrisbattleart.tumblr.com/
Eat, Sleep, Draw is a submission art tumblr, where artists from all walks and all around the internet submit and have their art posted. Really random at times, and also inspiring: http://eatsleepdraw.com/
Weekly art challenges challenges artists to make work based on a weekly challenge. Yup, just took a whole sentence to restate their name. I love the community they promote and the incentive their blog gives to artists. Take part! http://weeklyartchallenges.tumblr.com/
These are the best art blogs and artists that I know of on Tumblr. They give me daily inspiration and drive. I’m sure there are many more out there, but that’s why I always keep my eye open for more. Let us know if you have some blogs that you follow for animation, art, and inspiration.