The whole task sounds like a monumental effort based on the fact that you said it was "a small commission". Putting two people on a beach without good reference for the people (none of the photos show them in the poses used in the painting) and unknown reference for the landscape sounds like a huge and possibly insurmountable job right from the beginning.
It's very difficult to create a good painting with excellent reference (either photos or the real thing) right in front of you. It's just about impossible to create a decent painting trying to mix and match references that don't go together in scale, color, lighting, angle, etc.
I agree with Steven. Sorry to say it: this is one that should have been refused from the start.
I've learned the hard way that my paintings succeed or fail before I ever touch brush to canvas. It's (almost) all in the preparation and in what you choose to paint.
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