I lol'd. How does that take away from the image?
I mean, I've seen a signature rendering a broken lightbulb, but I thought it was pretty cool.
Anyway, I think the sasuke one was just a tad plain. The purple should be darker, and the render should be larger. I can picture it with him charging the chidori -was that the name?- and I think a slightly darker blue would fit too.
You nailed the shika one. I can't even think of proper criticism besides I don't like the deepness of the yellow.
Sakura one is pretty. I don't like to say this, but I think intense pink is kind of pretty.