Your art is very inspirational to all of us artists and at Shadowness we like to thank our amazing artists for all they do, to show our appreciation for you, your artwork has been featured in todays Daily Inspiration #531
I do to, the possibilites are endless. I'm actually uploading one now. I haven't done one in awhile but was looking through your gallery and felt the itch. May I ask which program you use? I use GIMP 2.4 myself - for the whole thing; it works great.
Yeah it looks great, I love how clean all of your lines are. Now are you actually drawing this with a tablet or using manipulation effects? In GIMP, even to do a planet I first make a land-map, then map that to a sphere, go thru a process of texturing, lighting, clouds, etc. To make a really really good one takes forever but it's just too fun. When you're done you feel like you actually created a new world, hehe.
This one took some time to create for the planet, I've watched many tutorials on youtube, I'm self taught, alot of trial and error, I use many fractals to create the nebulas effect changing overlays, some stock photos and painting in the desired areas and alot of playing around to see what looks right. I've never used Gimp so I'm not sure how hard it would be to create planets in that program, I hope this helps. Again, thank you for the compliments on my work, still looking for ways to improve the craft every day always learning. :)