The Tower #1 Some interior

This is a very well-done build, with a nice pattern and a great use of contrast. The quartz looks a bit garish in a few places, but for the most part it's good.
The double helix is a bit hard to see; the angle could be better. I also wanted to point out that the nether brick doesn't look too great on the edges of the fountain. It seems very out of place.
Finally, I do have to say that the immediate impact of the work is a bit... underwhelming. It's a good build, but takes a bit of focus to really see the beauty of it. Mostly I'd attribute it to the blockiness of Minecraft, which isn't your fault, but there are some things you could've done with the angle to make it a bit better. All things considered, good job.