im just trying something out with the teeth for this here transformation violet has :I trying to make the two rows of teeth look more... menacing-ish i donno if i wanna keep this look but maybe... i donno
I don't know about sharks, but for this pic, if you're unsure I'd like to suggest something!
Being demonic, I don't think she's all too worried about plaque and whatnot, so I think what I'd have done was to stagger the inner and outter rows of teeth, and perhaps scale down the inner rows. AS well, you could benefit from thicker/darker borders on the outter teeth to really make both rows pop out! I'd mention that they blend in, but it is just a sketch!
And hell, maybe the design behind all of this is, as well as the obvious predatory advantages, she could be cultivating specialized bacteria between her teeth for a gnarly infectious bite. Just like a Komodo Dragon!