Wow man, your a very good drawer. The homer one is great, it looks just like him on the show. The only thing thats kinda messed up on Homer is his lips, theres a weird line at the bottom up his uppper lip. But other than that, very nice.
haha its funny, some guy on another forum (gamerenders.com) thought I was lying. He didnt think I was actually "Yusuf Osman" and asked me to prove that I was him, even though I actually AM yusuf osman...
But I took it as a compliment, cuz he thought i ripped the homer picture.
I know of one way you could better that drawing. Using Adobe Illustrator to draw the out lines and putting in the basic colors. Then importing the finished vector graphic into PhotoShop to do the shading and blending.