It looks pretty sparse like that, and you don't get to say that very often for a model railway
I've got to be honest, I'd like to see the mock up where the station / platform / engine shed are not parallel with the front baseboard edge. I noted on your templot plan that the you had a slight convex curve on the front, but I wonder if the scene might not 'flow' a bit better left to right if everything wasn't square.
I don't think it needs much, perhaps rotate everything 3 to 5 degrees clockwise around the front corner of the engine shed just to enhance the front and side faces of the buildings.
You are going to need something on the RH end for balance, large tree or group of smaller ones, just outside the railway bounday and before the Parish boundary?
If it were mine (and I know its not so feel free to ignore this bit), I'd rotate the whole lot, push it back towards the backscene by a couple of inches, whilst moving the station and shed over to the right a few inches. It means the yard will be a touch narrower and possibly creates a pinch point between what will be the cattle pens and back of platform, but it gets the shed away from the edge of the board. This has two advantages - it reduces the chance of accidental damage and also allows the edge of the shed to appear in photos, without the baseboard edge. The disadvantage is that the track moves closer to the front edge as you move from left to right, but the prototype had a left hand curve as it exited the station so a gentle curve away from the edge might not look too bad. It also reduces the chances of the rear / LH edge of the station casting shadows on the backscene. Anyway, enough rambling from me, thats how I see your layout, not how you see it, and if I've introduced a egg sucking moment, feel free to tell me to stick it where the sun don't shine
Steve