Really nice colours, the sunset itself came out really nice but with so many sunset pictures (I think I cursed myself putting 'sunset' into my last thread title) I think you need to do something a bit differant.
I think the main problem is that there is a bit too much space doing nothing in this picture and a 90 degree rotaion of the camera and closer crop would bring out the purple vs pink contrast a bit better, either that or to try and include some interesting foreground to complement the picture.