I like that, it feels very fortressy and imposing. I only have a few suggestions. If it's built with the expectation of siege, you might wanna indicate a well and cistern for water. Also I'd assign the dungeon rooms on one of the sides of that floor for supplies like food and booze.

Also if you want to go more castle-like, you could make those two side staircases into spiral staircases inside those two internal towers they are next to. It'd also mean attackers who break into the central courtyard would need to breach the second set of doors instead of just ducking under the arcade and heading up the stairs on either side.