Ooh I really like this. There's really a smooth vibe I get from this that makes me want to look at it all day lol. The texture of this is what's really resonating with me though and kinda makes me think of the song "DNA" that I've written. Is this meant to be an underwater setting? This is really nice work for a "quick work" my friend. keep it up!

I like the background but as for the rest of things there is always soemthing that doesn't match up.
-The shadow of birds seems to be too sharp.
-The shining on towers coming from the above stands out too much form the rest.
- The entrance itself is poorly visible even though its the only source of normal light. I really would like to see the boundaries between entrance and walls but the style makes it impossible
- I dislike how stairs on top of main tower look like. I get the idea but it doesn't look good. I think it may be due to stairs being to big.
- My (not so) favourite is that tower right form the main one looks like stag and my mind can't get used to idea that it's play of shadows not a stag's head.

Ps. I'm sure many people will love it regardless.