"I suggest you move to some good GFX sites, like PR, where they can help you further on."
Ouch. Is that why you're still here then?
Generally when you have bright lights, they're going to detract from the focal (in this case it should
be the smaller render) which isn't good, since obviously the focal should be the focal.
Borders, especially the kind you did (set the layer to burn or something) looks really, really bad. The only way borders work is if their (generally) black and set on normal. Even the best tag makers can seldom pull borders off. It's not that most people don't like
them like Seta said, but they only work with some tags, and you have to know what tags those are. You have a good concept going, just work on getting nice sharp high quality effects instead of blurry ones. Since you're still relatively new, I wouldn't worry about depth, lighting, etc, work on effects, render choice (<-- important beyond belief), finding and enhancing a focal point, etc.. Anyways, keep up the good work!