PENUP
PENUP is a creative SNS based on Pen generated images. Share your imagination with global creative minds.
20 Alternatives To PENUP
QueekyPaint
QueekyPaint is a unique browser-based drawing tool for creating animated drawings online.
Sumo Paint
Photoshop in your browser, Sumo Paint an advanced browser-based image editor.
pixiv
pixiv is an illustration community service where you can post and enjoy creative work. A large variety of work is uploaded, and user-organized contests are frequently held as well.