/ic/ - Artwork/Critique

OP, when you say tumblrina, do you mean fan artists like p-curlyart and ieafy, who focus on prints for conventions and cellphone charms?
Do you mean pros like sachin-teng and teaganwhite, who focus on slightly higher-end prints?
Either way, these artists have found themselves a niche. Something that they love drawing, that they can draw repeatedly in new ways.
Find something that you love and draw it a lot. From reference, from memory, distort and destroy it until you find your niche.
Can't find something you love? Start a new blog, keep it clean, and draw pokemon. Lots and lots of pokemon. Make sure you tag your shit so ppl can see it.