Very cool stuff, I love your shapes and the muted colours! Although I think that the starting ships imply a sense of life that I kind of miss in the rest of the piece. One other tiny thing that bothers me a bit is the right cloud, which kind of moves in line with the rockets and almost touches the tower...That is something that keeps distracting me. But overall these are just tiny nitpicks, because I really enjoy the image
Brilliant composition with this piece. It almost reminds me of something I drew a few years ago, granted the scale of the closest tower, but it's really just a memory and nothing more. It certainly could pass as an ancient starship that over the years has been converted into a tower to support activity on the planet. The blend of nature is very good as well.