I don't like the weird brown things that stick out halfway up, are they meant to be windows or something? Whatever they are, they're terribly over-sized and i don't see why they're black.The base could do with more detail but other than that, this is a good build, well done
The bottom to me looks medieval with the brick pattern then transfers into modern at the top. It is a cool effect, but I don't really like it in my opinion.
The upper half of the tower is good but the main body leaves much to be desired. its quite bare and the middle windows/whatever they are don't fit in well.With the top half you could make some really impressive stuff. I'll leave these pictures here for you to look at.-snip--snip--snip-Note that you don't have to make it nearly as complex; just improve the general design of the main body and it would be a lot better.