I would like some critique on this character Im going to use in a 2D side-scrolling Zombie apocalypse game please.
This is the first time Im really trying NOT to use a black outline around everything and Im finding it really hard TBH. Any advice, examples or edits will be much appreciated.
I would like advice on everything really...light source, shading, colours etc etc.

This is not a sprite I made from scratch though, and is instead an edit from a SEGA CD game character from 'The Terminator'.
I hope that is OK. Im not planning to make money off the game or anything like that...just doing it as a hobby.

Anyway, heres the main character -


And here is the ORIGINAL sprite from The Terminator(SEGA CD) -


Thanks.