That pic of Cap'n America is .... uh.... not very well done?? I think it's second rate. He's way too barrel chested, out of perspective and proportion? Even for a comic, the color and shading are nice, but the art itself bites... IMO could I do better? maybe... rH
For you animation, Simpsons and comic book freaks! A friend of mine works for an animation cell art gallery. They sell original free hand art cells of all kinds of goodies. A bit pricey but if they don't have what you're looking for; they might be able to find it! http://www.animationartgallery.com/