Useful feedback all round thank you.
John thanks - Print size will be A4 max. There are three narrow oblong areas between the several windows in the orangery and I had in mind one small print for each.
Mike/David/Binnur - thanks.
Mark - I was reasonably happy with that area until I tried brushing over it with the mid tones of the sepia. I think it's an improvement. The revised image is below. Thanks for the input.
Geoff/Izzie, I can't remember whether I added the grain after the toning which might be the cause. I've added some red (not yellow) to the sky area and it is slightly better - see below. Thanks for the thought.