Thank you for the advice on this one, I think I'm done. To stop myself from fiddling any more with it I'm going to frame it straight away. I love painting the coast. The river made a nice change but I think I will always come back to the sea. Maybe it has something to do with being an islander, I was born in Jersey in the Channel Islands and lived there until I went to college in Cornwall.
I think my next painting will be a 180 degree turn (more or less) and a view of Old Harry Rocks. I've sketched from the cliff top there but to really appreciate the shapes I think it's best seen from the water. For this one I'll need to rely more on memory and reference photos taken from a boat trip going around the headland. We went past Old Harry pretty quick and I found it a bit of a challenge sketching on the water.
Loriann has been posting the most amazing memory paintings over on her blog and is inspiring me to take up the challenge. She's not using any physical reference at all, the results are fantastic.