Hello, I have trouble interpreting the isosurface of the pi electron character of coumarin (see figures), please, I ask for your suggestions, thank you.
He should first specify the topic of the question, because of it presents only picture, which does not mean noting and do not say noting? Other details on the optimization procedures are needed - not only theoretical level.
You should mention which information do you intend to extract from the pi electron distribution (for example, predicting reactive site, revealing aromaticity due to pi delocalization...). Simply providing a graph is not helpful.