You have to do what YOU want, not what some professor says. You already have a vote of 2 to 1 in favor, if that really matters to you (it shouldn't). One said you were great, the other wants you to teach him. So what is "too pedestrian"? That sounds awful vague to me. Is it like "not edgy enough"? Blah. If that was the "critique" I would just blow it off, shine it on. It is an absolutely useless remark. What about the log? Do you leave it in or kill the tree? Leave it in. Assuming you are an amateur like me, the best advice I can give is this.... Look at other people's work, take from it the lessons and things you like or aspire to, and discard the rest. Don't be too shy once in a while to tell yourself "Damn I'm good".