Well, since nobody is biting, here's a few thoughts.
7: More normal would be to approach the R4 stone to stop white getting two shimaris, though this is not unplayable.
13: A kick at P17 would be normal, because even though white gets strong by extending to O16, he can't make an ideal extension as black's top stone gets in the way. When white instead plays L17, he's a bit cramped, and black still has forcing moves.
17: For instance, this move would be more powerful (black can even do K15) if he has previously kicked at move 13. This way, white isn't so worried because he's already made the corner slide to get strong.
37: The left side is *really* big right now, black wants to make a massive extension and thus a huge moyo. S18 makes black's group safe, but I'm not sure it's in much danger as it still has the R12 extension available. Plus, S18 has no real effect on white as he's already alive locally. I'd be inclined to just take the massive left move.
38: Seems rather small, when a white move on the left would prevent such a huge moyo.
39: Wrong idea. This just changes white from being alive to...still being alive. And in gote. Black isn't even annoyed by a white move at L15 or whatever, since if he's just played on the left white would be pushing him to make the moyo bigger!
45: This move simply has a bad idea in mind. It's completely gote, and has no useful purpose - black wouldn't even care if white played N15 and was allowed to capture the N16 stone, it's all tiny compared to the size of that move still available on the left!
52: This area has been the biggest on the board for more or less any move since I first mentioned it. Something to think about

. At least white has made a long extension that black can still invade at C8.
53: You've got to be *really* sure a move like this is sente. If it turns out it isn't, it's a tiny number of points in gote, which is very small compared to the big invasions available. Black needs to do something powerful with his top left wall, but he's instead spent many moves making it incrementally bigger to surround a live white group, while white slowly makes strong positions where black's wall use to dominate.
After this, black remembers to make some invasions, and white turns out to not be very good at handling them, so the game quickly turns around.