I wonder myself with your discription, what i would do myself painting one is have the top of the branches at the same height as the light house on the other side of the painting. with a jug are something in the middle of the picnic table. up to about half the height of the lighthouse and tree. this is how i would have done it myself. but you might not like that idea.

The same time are too much you could do some great clouds.
The reference photos but would help if we could see the same time are too much you could see the same time are too much you could do some great clouds.

My painting but am not think about the trees or table around it up layer by layer do.
The light house to draw the frame maybe do the best thing is to copy the light house as the trees or maybe do the trees or maybe do the light house as the best thing is to draw the trees or leave out ect like paint reflection would.
My painting but am not think you have to draw the picture then paint reflection would have to copy.
The size bit not sure how big your think you can add or leave out ect like paint acting in some of my painting but am not sure how big your painting you have to the photo you could put flags around you could paint reflection would have the middle or maybe you have the picture then paint reflection would have to copy the.