Day And Night

I want to really like this, however there are a few design flaws that you could easily fix to make this a truly amazing piece.

First the texture of the planets. When I zoom in to %100, there is some serious texture tearing and pixelation roughness. I'm assuming this is from stretching out the images in Photoshop (I will release a tutorial on how to avoid this, shortly). A quick note on how to fix this: Fade out your planet's texture gradually, and replace it with a glow-y atmospheric non-rough texture. Using Outer glow works in some cases, but there are more effective methods. I'll be sure to include this in my tut.

Image composition is decent, although I tend to favor more realistically sized planet to moon ratios. You wouldn't see these spaced so close together, let along so many in one spot. I'd reduce the number of planets/moons to 2 or 3, and use some atmospheric lighting to create perspective and add body to the negative spaces in your image.

Stars are a bit weak... feel free to use my 5k pixel clean high resolution starfield. Background could use some sharpening I think too. Sun glow is good, colors on planets are weak, and need some contrast.

Again, I really like this, and you have the talent for this type of art. A personal bias: I'd avoid doing common things that other artists do (like the small space ships) and shoot for something more unique. Stick to smaller resolutions until your image quality improves-- it'll be a lot easier to make large-scale adjustments, unless you have a beastly workstation. Focus on improving your methods and you'll succeed in your pursuit of space art for sure.

Regards,
F4lyn