Is this old Jay Langer stuff?
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I heard from Mike Rennie, who heard from an old timer, that a tattooer should have a sheet of flash for every month he/she has been tattooing. I've definitely slacked on this regard. All the advice above is sound.
Initial critique, focus on doing things other people do it, at least in a manner of repetition and copying. Style takes time to develop. Right now you just need to know how to draw it correctly. When trying to create an original design, do not be afraid to use reference. The beauty of developing a design is pulling from different areas and crafting something that looks right to you. The mouth of a Mike Wilson panther paired with William Yoneyama snout, eyes the way Tim Lehi does them, and colored how Mike Rubendall approaches color. Or even better, grab elements from things that are completely not "tattoo" related. Old Circus posters, woodcuts, Audubon prints, *gasp* going to a zoo or museum. There are so many places to pull and subtract from, that in no way does it need to be mediocre.