Second one, your background is very well done. I would mess with the tree branches to the right with blending modes and opacity a bit and see what you come up with. Try a different render with it though. The boarder is a bit big, but it somewhat fits, if it were all the same colour.

I'd like to see what you can do with that.

The third one, I think that your border works relatively well , your bg needs some work, the render seems to have rough edges, and it needs some very simple text. With a boarder like that I would try out some text placed on it. It might look cool.

Good work man.