Patty, I think it's looking great so far! At first glance my eye had to travel over the sand to get to the children, which shows depth already!
One thing I would encourage you to do is work on the children the same time you're working on the surroundings. My teacher called this "working a passage." She would draw an imaginary circle (like I've tried to do on your picture - hope it worked) around an area and say "paint inside the circle." Then she'd "draw" another circle somewhere else and say the same thing. And if you keep "painting inside the circle" you end up with a unified painting and avoid a cut out look. When you paint inside the circle you paint everything at once, rather than painting the individual objects. It took me a long time to understand this concept myself and I hope I've explained it in a way that makes sense.
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