The lighting of the background should be similar to the character lighting.
The background with blue tons, and more contrast would look lovely behind the rain.
On the lettering I would go for some or sharper and stronger, or something more blurred and lighted.
As the border, seems like it has bevel on it, not much fan of inner shadow either, would go for a strong inner glow.
Well, I'm just being perfectionist, in overall I like it.
cheers bro.