I found your gallery while searching for reference on space art here on DA, coz I had to do a scifi illustration for Geo magazine with a steep deadline. So I wanted to say... 1. thanks for the inspiration, I loved the magical glow around your space scenes 2. this is my favorite of yours.
I think i may have commented on this...hmm, well even so i have more to say!
Ok...so, i look at it annd...well, wow! Looks great! The depth and composition are pretty top notch. I have to mention the lighting aswell, its amazing, so realistic, i see so many planets that are the same tone of light throughout. But the lighting in this is, hmm...dynamic?!
I like the textures too, especially the planet...however, i just have a thing about being able to see the repetition of a brush, in the "sky." So i'd watch out for that, just to give it the extra realism.