A very gay picture. I approve. It's very typical, but that might be part of why it's so cute.

Not much for me to nit-pick at except...

Ah, well, the anatomy. UK's torso seems overlong, especially in comparison with America's. His face also looks a bit awkward, like his mouth doesn't... connect. It seems to be in the wrong place. Also, America's fingers on both hands seem a little too thin and posistioned oddly. But I don't spy any other anatomical errors, so that's all good.

Well, the anatomy was the only thing I really have critique for. Your lines in general and your colors are very good.