I also think the pillar texture looks a bit off on closer inspection. Outside corners shouldn't fade to black like that - if anything, maybe they'd actually have a slight whitish look along the edge. Shadows/dark gradients should be reserved for concavities.
To me, the column bricks on the courtyard wall seem to be scaled a little too fine--they don't blend well with the other textures. Also, there's a slight blending problem with the ground just outside the opening; the seams are clearly visible. Other than that though, it looks good.