I don't see the logic in not fixing it if you agree with Logiedan. Maybe you don't give the fix to the guy who requested it, but it'd help you become a better spriter. So why not?
You got a point, but...
I still don't want to modify them, I'll only modify if the commissioners ask me to do it, it's not that I don't want to improve or anything like that (that's why I have my sprites and my Pokedex), but it's like I sold the product and everyday I go to the buyer's house to fix it or improve it without his permission, seems a bit wrong.
I'll do only the proper modifications on my sprites, sorry.
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I added 7 more sprites to my Pokedex and 9 more to commissions. ^^
Examples :