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Please bear in mind that I am not a professional .... only a DWAC (dad with a camera ). So take my input with grain of seasonings ...
you titled the photo as your son & grandchildren. However, they are very small in relation to the total photo. If I were taking this photo, I would get very close to them and have their faces as the center point of interest. Hope this helps.
That is a very good suggestion.
Whether near or far, having visible faces helps most photos have more appeal.