Re: some sigs and avatars
Ok, so first things first.
The sigs look pretty weird and stretched. Try to make them look as normal.
I won't tell you anything about the cromatics, as I see you keep it in the same area, which, for the beginning is good. It's just how I am doing now, only one color or same shades, later I'm going to try to improve it and play with more colours.
For me, some are a bit too dark.
Try to focalise light on the important element, meaning the render. The render needs to be your central point. You can have the background a bit darker and put some light on the render so it stands out. But a balance needs to be made between the two of them, of course, so that one won't look too dark and the other too light.
Hope you get the ideea.
As I can see the blending is pretty ok. I have been advised to erase the margins softly for a better framing, make it look that it's from the same picture.
Hmm this is what I can tell you at first sight. I find them pretty cool as they are.
The rest it's kinda only up to you to play with colors, effects and so.
But if you are a beginner, these are really nice for one!