A : yes! That's right, It seems to me that overview of this painting full of sadness!.For several reasons,For example, an image it used to from geometric and color of the dark color so look depressed.
B : i see what you mean, but i think color should indicate the bustle of life, so it makes him sad, because the colors he used. It looks chaotic, so He must be feel confused and sad at the same time.
C : i agree with A ,In my opinion he look sadly and His eyes filled with hope inside the heart. Because should have to be a result from the Chagall's story.
D : i disagree with B ,I feel that He felt sad and I miss home only. Because Picture him drawing is natural at His hometown.
E : i agree with A and D, it same to me that He must have lost his lover and must be separated from his hometown, because I think Chagall convey his own story down in the drawing.