They look pretty darn good to me for quick, cheap, and dirty paint jobs! You might consider adding a little static grass or 'snow' to the bases - it's quick and easy and adds a lot to the looks.
I've seen people use the old West End Games SW figures in several dioramas. Gaming figures work really well in stuff like this.
There are a couple D&D type SW games too. I played a bloodthirsty assassin droid based on HK-47 from the Old Republic computer games in one. My favorite memory was when the party presented me as tribute to Jabba the Hutt and I grabbed one of the guard's guns and started shooting up his palace. It ended with Jabba screaming 'THAT'S A ASSASSIN DROID NOT A PROTOCAL DROID YOU !!!' before his security force field went up and his throne sled popped though a secret door.