Hello there Chibbin, and welcome to the Guild! A very nice battle map that. The texture blending is good and the composition looks pretty good as well. As this is a darker map I imagine this is night scene? If not, I'd consider lighting it up a tad. A few pieces of constructive feedback:
1. It's unclear what the relative height of this keep is. On the one hand, there are cliffs, but the shadows don't give us much indication of how high up the keep is. Also, the diffused lighting scheme doesn't much help either. I'd recommend going with some form of directional light and cast shadows, even if it only moonlight.
2. I'd also suggest making the distinction between wall and floor a bit clearer e.g. by say slightly lightening the walls and/or adding darker cast shadows.
3. In certain places the floor tiles begin to compete with the grid, making it unclear which is which; you might want to think about making that distinction a bit clearer as well.
4. It looks as if the sentry statues on either end of the keep's gates have some sort of two-tone light going on. However the light doesn't seem to illuminate much, or cast shadows anywhere, and thus looks a bit artificial.
All in all though it's a nice piece. Thanks for sharing.
Cheers,
-Arsheesh