looks a little narrow, a little high in the front to me. Hard to tell by photos. Some Wintecs are adjustable, so that could be fixed.
You should have a hand's width from your butt to the cantle, and from your front to the top of the pommel.
Thorowgood's are wider in the seat - mine feels like a sofa - but they are more expensive. Older models are on ebay for $200 to $300 usually, sometimes less.