The lightning is quite realistic aswell for the rain but offcourse it can still be improved but this is an know issue with each and every thing in a new game I thing you make the rain look abit to "straight", what I mean with this is that you should give it a more random look. The lighting is perfect as it is, I wouldn't change anything more on that matter. One small detail is that you should make the camera movement stop at a sertain angle, I could tilt right under need the player

Cheers

Frazzle