There are not much variations in textures (ofc surf "blue) but stil. Those default ones in map are not that good and if you have to use a short choice of texutres, make sure they are good and use them good !
Also, i like the way you try to use different ramps that's good.
Ur map feel a bit empty and unpersonnal.
Try to think about what you like to play and what you like to see in a map. Then apply it by putting efforts in it and time.