..,

hey! i have some tips for you!:
so the only tools in the editor you should use are: bucket tool zoom in zoom out darker lighter copy to other arm/leg color picker undo and redo so dont use auto shade you should more imagin there is a
light shining from anyway on your skin and make it go from light to dark from that place
EXAMPLE: https://www.minecraftskins.com/skin/22853737/bear/
hope this helps!
(P.S. this is meant to be rude just wanna help :D)