Glad to see you're enjoying the new D3100, Pete! A couple suggestions:
1) Color. Anytime you venture into this end of the color spectrum (ultraviolet), less is more. Because the color is so vivid and intense, it can be almost distracting to look at if there is too much of it. About 70% of this image is filled with some pretty intense color. I think it needs toned down a bit.
2) Composition. There's a lot going on here. I don't see a single focal point, there's nothing that draws my eye towards the center or around the image. For lack of a better term, the composition is too "busy".
Suggestions for next time: Find a single flower of this color and photograph it against a dark background. I think you'll be pleased with the results!