Looks good jt. I have a few comments you can ignore if you like.
-Lyandra is not talking about your two-stage shadows, she is highlighting an error to the immediate N and E of the NE tower and E of the E tower.
-your tree in the south of the keep looks as though it is a large area of chemical warfare fallout due to its extremely green oversaturated colour. Maybe darken it to look like the trees in the forest.
-scale issues: there are some scale issues: the hay texture compared to the bales of hay; the battlement crenellations compared to the horses. For example, each individual slate tile on your keep roof is the size of a horse; the planks covering the stables are each about two-hundred-feet long and twenty-feet wide. I'm not sure if you can be bothered to change this - but it creates an illusion whereby the horses look like miniature lego horses set out inside a normal-sized castle.