A: I think the painting is meticulously well-crafted. The expressive display of vivid colors and smoothness of the edges are easily spotted on. I'm very impressed by the quality of this painting.
B: I feel the same way. The portrait illuminates not only the concrete, tangible surroundings of the person that the artist painted, it also indicates his inner thoughts and visions.
C: I think you're right A and B. Try to focus more on the facial expression. I also think that the clever use of painting within painting adds a deeper meaning and a new layer to the actual painting itself.
D: I see what you mean C, but I think the artist is only trying to show off his painting skills. I don't see any deeper meaning except the sheer pretentiousness of the artist.
E: I strongly disagree with you, D. This is a masterpiece, possibly one of the best pieces the artist has ever made in his career. Although, one may disagree, but it would be wise to keep in mind that arts are usually subjective.