I had similar thoughts about composition. If it were my picture (which it’s not, since I am new to blender and could barely model a leaf) I would try moving the grave scene to the left (+ angle grave to the right instead), nudge the wheel barrow to the left, and perhaps add a path in the distance which appears to lead up to the mill. It already tells a story, but it would lead the eyes across the picture then, from grave, to barrow, to path going up to the mill - making the story behind the picture a focal point.
Also, I’m terrible with artistic license, so I tend to think silly things like “are the clothes appropriate” haha. In this case, they don’t appear to be suitable dressed! At least, they don’t appear to be wet from the torrential rain, so that is a small barrier to believability for me. I should note that I understand that stylised design does not necessarily aim for realism - I see believability as slightly different. I can still believe that a fantasy image could possible exist as, albeit in an artistic stylised form, hence why I don’t usually break all the laws of physics in art even when it is not intended to be realistic (e.g. we generally include gravity, relatively natural lighting etc).