Very, very basic signature which doesn't look too good. Firstly, it's too messed up, a lot of images slapped over one another, overlapped and erased to blend them together. But it doesn't look so good here. Secondly, the scale you were working on was too damned small and all the stuff you added up in that small space was just too much. Another reason why it looks so messed up.
No particular theme of colours as well, there is a mix of different colours which doesn't look so good (blue, purple, yellow, red etc.) You should at least try to give it a clean finish. Play with some adjustment layers, gradient maps and photo filters to achieve the best results. I mean, something like this with two or three colours:
Best of luck.