@MISTER BIG T: The FF7 version Tifa is drawn with an anime face. So the answer is no.
Trying to make THAT would render her incredibly ugly and cross eyed looking, seeing as anime is all about reducing other facial features and increasing eye size. She already has slightly bigger eyes, making them even bigger would make her look like a fish when standing next to another person.

No, I wish I could sprite that well. I've just been splicing together chipsets from different sites like Mac & Blue sets and stuff and doing some minor edits. I'm compiling a full list of the chipset makers for my credits list.
You really shouldn't bother with the list unless people really ask for the credit and even then, that's totally gray area. Go ahead if you do but I'd use that time as well to work on the game itself and/or things for it.
To make it sound less pompous to certain "special" people; I'm saying unless the chipsets weren't done for your game in the first place and they were from a released medium (demo/full game, shared resources) then you have no obligation to really credit the resouce because it was already released and by that became public domain. If they were done especially to you or you stole them from a WIP game specifically shown to you, then yes; credit is must.
Or are you going to credit the people who made the music? Is it 100% custom or if not, are you going to credit people who did the musical songs, including remixing/arranging/altering of the said song? What about the people who made the sound effects? Are you going to track every single person who made every sound you've used, or are you going to make all the sounds yourself?
Giving credit to person who's work you are using isn't making it any more yours than the original resource makers. It just means you're using same resources but trying to justify that someway more than another rpgmaker.