Not bad, but could be better.
I'd be careful about the gun cabinet thing, insofar as the distance it protrudes into the room could make it difficult to make the bed (unless the scale shown is not an accurate reflection of the actual dimensions you plan to use). Also, the top shelf appears "cluttered" with the projections above the shelf plane. Narrow block on left, gun closet on right. Why not make it one smooth flow? Doing that will make the room look larger.
And I'd give some thought to adding built-in shelves on both sides, recessed into the bump-outs. Can never have too much storage, whether it's for books or just kitsch.