I love that there's fans on ceiling and the windows for horses to stick their heads out of. The only thing I don't like is the doors down in the left corner. These would be just some stalls. Maybe for the lesson barn?
Make sure size of shutters are to cover Windows.Shutters that are tacked on the the siding without regard to the size of the window and without shutter hardware detract from an historic home. Use beautiful real shutter hardware to mount your shutters!
Would be a cute pen for smaller animals pretty cool little barn, though I don't know about roll up door. Mesh seems a bit off to me, but it seem to be a somewhat popular choice, wonder what the exact safety/ benefit is?