They look pretty cool. I bet the colour scheme looks quite different in real life to that which you have now in the pic though, right?
Are you using the macro setting? It looks like it, if not then try it. If so, I have found lately that I can get much better pics without the macro setting. The trick is to have lots of natural light, because that floods any effect the flash on the camera might have and makes the colours look more like they actually do. Taking the photos outside can work, or use a bright white light. The lamp I paint under is white rather than yellow, and I aim it directly above the models to photograph, quite close. Then get a flat colour for the background, a sheet of white paper usually works well enough, or cardboard for a more neutral look.
Try to get the camera at the same height as the model, so put it on top of a jar or something to get it a bit higher if needed. Then hold the camera at around 40-60cm with a bit of zoom, but not too much. Photos on digital cameras come out very big so it is not necessary at all for the model to fil even half of the frame, you can open it in paint and crop the outside and still have a good sized photo.
Experiment with different zoom amounts and distances from the model, take a whole bunch of photos at once and just delete any you don't like, also try experimenting with the flash turned off or dulled (I put a tissue or two over it so it isn't as bright) and see how you go. That is what I do for photographing miniatures and usually get pretty good pictures. Good luck.