What is the conversation mainly about?

W:Hi, Mark, it’s a pretty good painting.
M:Thanks, Judy. I’m just learning.
W:En, there seems to be something wrong with it though.
M:Yeah, it doesn’t look right to me either.
W:I know,the sky doesn’t seem to fit in with other colors of the painting.
M:What do you mean? Everyone knows the sky is blue.
W:Well, that depends. Sometimes it is and sometimes it isn’t, as sunset can be full of reds and purples. Evennow, look up now, Mark, what do you see? Do you see a kind of tannish color?
M:Oh yeah, I see what you mean.
W:By adding some tan to your sky, I think you’ll get  more actual picture, and the color will look more natural.
M:I’ll try that. How do you get to know so much about painting? Have you taken a lot of courses?
W:No, actually.But my father is an artist.
M:A professional artist?
W:Oh yeah. He’s shown his stuff in lots of exhibits.Ever since when we were kids, he always talked to us about his work.
M:I wish we could talk some more, Judy. How about going for a cup of coffee?
W:I’d love to.