Would photographers and PS artists please look at the composition of this picture?

Blue is late. The specific operation should be to shoot this scene first. I don't know much about photography. Personally, I think it should be the effect of lighting and small depth of field. Then dig out the box and put it in a new layer (the new layer is above the original layer to prevent the box from being affected by post-adjustment), adjust the scene layer (that is, the original layer) to this blue tone (black and white tone below), and then use the mask to make a dark corner (the effect of bright dark corner), but this may be the effect, so there is no need to make a dark corner.

This shadow is not made, but the actual effect of shooting.