Not bad. Some tips though:
1. Use a bit higher res for the planets maps. The close up shots clrealy bring up the lack of detail.
2. There are some problems with the light-dark transition with the first two gas giants. I'm sure you can noticed them.
3. The dark side of a planet should always be black, unless there is a good reason for it to be illuminated.
4. Atmoshpere. Make it both smaller and more intense. Planets usually don't glow quite that much

Overall, quite nice but there's room for improvement. If you want to learn a few more things, PM me and I'll be happy to help.