Looks good; I see you used some hurricane images there. Some improvements could be done; Those planet clouds should have shadows (I think the best way to do this is to select color range on the clouds layer and paste the selected clouds to a new layer, then add a drop shadow and put the layer to screen. Additionally, you could duplicate your clouds layer, run the emboss filter from the opposite side of the light source, and then put that layer to overlay or soft light (or possibly hard light with lower opacity), then you might desaturate that layer if necessary). I most commonly use the hurricane images to darken (I invert the colors and set the layers to soft light/overlay/multiply/linear burn/color burn witgh varying opacities) space dust layers below (which would be hurricane images as well as fractals, and, perhaps more importantly, a soft brushed background). That upper right planet is really nice though.
well thanks for the tips! haha. clouds are no problem for me, i just struggle to make them look above the ground. but those tips should help! and yeah i just started to take more care of my nebula too. because i now understand how to texturize them. i also have a wacom pad which allows me to paint them in.