I say at a 1.
Legion
Not only does the tower depend somewhat on what
Beowwulf said, but location, location, location. If this was placed near the top of a Volcano, that would be cooler. Let alone, the biome's condition also says "I look sexy" or it says "i r profeshunal". The bits of Cobble could be removed, even that little thing is quite visually disturbing, let alone the eye is too large for the rest of the build.
Also, you need to note that Texture pack also affects how it could look. I have two example builds, I spent about 5 minutes to build each one,
This one looks okay, because it blends within the background, and it has an appropriate texture pack.
Now this one doesn't look as well with a different pack, does it? [See bottom]
This is one no matter the pack, doesn't look good at all because of location and style.
Location, style, texture,
Time. Take time in your builds, too! A good 5 spare minutes on a build can make it change from poo to new!