Thanks for the comments.
@ jtougas: about the water I think that I am going to vary the darkness based on the depth. I was a bit stuck yesterday but I easily found a solution this morning, and thanks for the tip on the road, it shall certainly find usage.
@ Aval: yes I agree with you that the grass doesn't have the correct scale.Now I'm trying to decide if I want to scale down the texture or redesign the whole city, but I think I'll go with the second one as I'm not quite happy with the way it looks.I'm also thinking that if I scale up the city the eye shall be drawed to it easier and yes it was really helpful