Yeah! I think the biggest is that you ought to consider first, esp if its an OC, your reasoning for making the character disabled- you wanna make sure you're not fetishizing or exploiting their disability to prop up abled characters. I've got a list of questions for authors to ask themselves along those lines that I can post or dm

Secondly, you have to consider what level of realism you wanna go with. If you have a character where, in universe, the prosthesis functions in exactly the way an arm does, you could just go with that if you want - it's the path of least resistance, right? BUT you ought to consider that most prostheses in media exist in that way AT THE EXPENSE of good representation of disability. Erasing disability or "curing" it with magical prostheses IS a form of ableism that is so pervasive it just goes unnoticed by most. I believe personally that disabled bodies are worth portraying well even when the creators of the source material did not do that. SO if you want to go with real well thought our representation, here are some common things I think authors and artists often miss (specifically as it pertains to upper limb prostheses):