Your mars is quite good, you need to blur the white halo around earth more and sharpen earth itself. Also the space looks slightly repetitive, other than that looks ok!
<constructive criticism>
Haha, just kidding. But really, it's good but they just don't.. blend well. You know what I mean? Maybe it's the halo or something, but it just looks like they were pasted on top of the background.
</constructive criticism>
I ran through a tutorial for the first one, and just kinda played with it for the second one... I imagine I'll continue to use that method for learning new stuff. Follow a tut to get the basic idea, then play.
My point exactly, bullshifter. The green moon has a shadow almost exactly sideways, implying that the light source is perpendicular to that. However, the red planet has its shadow pointing in the opposite direction, yet the light source is clearly supposed to be behind it. Unless you mean to suggest that the point of light is in fact on, or close to, the surface of the red planet and is projected across its surface in the manner shown. But I don't believe that even you are that asinine.
The shadow on the red planet suggests that the light source should be in the lower left of the picture.
My point exactly, bullshifter. The green moon has a shadow almost exactly sideways, implying that the light source is perpendicular to that. However, the red planet has its shadow pointing in the opposite direction, yet the light source is clearly supposed to be behind it. Unless you mean to suggest that the point of light is in fact on, or close to, the surface of the red planet and is projected across its surface in the manner shown. But I don't believe that even you are that asinine.
The shadow on the red planet suggests that the light source should be in the lower left of the picture.
Silly monkey, clearly you've never heard of binary star systems.