I really like it ^.^ The contrast is really nice and I love how the colors get progressively darker.
I prefer it on the dark colored shirt because it appears to blend into the background. Perhaps you could get it to blend even more though? Also, the one part of the sun shooting off on the top looks cut off- maybe you could lenthed that and gradually taper it off?
I really like it though. ^.^ If you get a chance, look at one of mine? ^.^