PSE 2019 How can I stop my image, on top of the background image, from lookning copied and pasted?

It's not entirely clear how you think this could be improved.  This is such a low resolution image that it is almost impossible to make it more natural, particularly since it is an illustration.  The only tell-tale sign of a copy-and-paste job that I see is the white fringing around the hands.  Because of the low resolution, I think the only thing you can do is zoom in to individual pixel level and clone the neighbouring pixels, one pixel at a time, with a 1-pixel brush.  Here is a quick edit: