Beautiful colors and form, but lacks detail. I would advise simply painting more over what you have here, and trying to make the smudging a bit less apparent when zoomed in to full resolution. I love the way this looks but could not use it as a desktop because of that
the form and colours look good, but the smudging is too apparent. Try overlaying some texture in it, like maybe clouds, or marble. Marble should give an interesting finish. Also, you could try airbrushing on a new layer some (small soft brush with very low flow) and then setting the blending mode to overlay to try and make some forms stand out, but that's just a personal taste of mine
Good luck with it