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Look up all of the tutorials in the Help Forum from Butters, AlHajri and everyone else. Every tutorial teaches you some or the other thing new, so try and look up all of them if you're really into graphics. Also have smaller signatures of size 400*200 or 500*200 pixels not such big and wide ones and then the magic word... "blending"
I love the outline of Jericho in the second. They are just a bit too big though. Make em a bit smaller and put a boarder around them and they might look a little better.
Lighting on the left one is bad. I'd recommend making a background rather than getting a wallpaper (Which by the way is my current wallpaper:laugh Look at some tuts on bg's and that should help. It's alright though, but all you did was put two psd's over a wallpaper and wrote his name.