’tis a lovely scene no doubt and it’s a nice composition.
I think with photography the light is most important and the quality
of the light here is not the best and your seated subjects are a little in the dark.
It is a little underexposed and this can be improved in post processing software.
This can be done in a number of ways but a levels adjustment will improve it a lttle.
This is a scene that might look spectacular with some low late evening or early morning
light picking ot your subjects.
Thansk for the comments. I agree completely. However, I was just on the beach and the scene caught my eye, so I took the shot as best as I could, but it was against the sun. So I took 5 exposures and this was the best HDR result. But I will have another go at it with your comments in mind and I will post the best original and the result.