Grainy
Good composition, but frankly all of your stuff is grainy. It seems deliberate in your abstract art, but this looks like a realistic image, in which case the graininess is a disadvantage.
Is this an artifact of using Bryce (unlikely) or of using Irfanview (more likely)? If it's Bryce, there HAVE to be settings to get rid of that and make it smooth and antialiased. If it's Irfanview ... well, honestly, I'm baffled why you use Irfanview anyway, so I'd recommend switching to GIMP or another powerful, free photo editor to solve the graininess.