No, the handle is okay, in thickness, it's just too short compared to the blade. The Tsuba is to small, it's hardly noticeable, which'd make it a Shirasaya and not a Katana. Also, the blade looks too thick, but I don't think it's possible to get a better result without loosing the shape...
PS: I was the one requested a Katana icon :D Well, semi-requested, as my game doesn't uses icons...
PPS: I have a Iaito (training Katana, slightly heavier) and a Ninjato (also a training blade, but just to point out it's not a Katana-like Iaito :P ) over here... if real blades wouldn't be illegal in here, I'd store them in my house like I do with food :P
PPPS: Shirasaya rule! :D