A pretty good build, the rockwork around the river is superb, and the vegetation is very nice. A couple things though, have a dominant color in the tower, either light grey with a little bit of dark, or vice versa. Same thing with the floor of the tower.
Fantastic build, and welcome to MOCpages! This build is quite impressive! I really like your rockwork, especially around the riverbank, and your water technique looks great! I can't wait to see more of your work!