At
, as a minor quibble white needs to play one or two spaces to the left if the plan is to split the side. Playing on this spot makes black's choice of side too easy (he should approach from the left).
For
I don't like the gap between this and the corner. White owes a move here. Maybe approach from the other side, or make a large corner enclosure?
For
I am worried about the group on the bottom, since it's not that strong yet. I might want to hold off for a reduction too. It's also not entirely clear what the followup should be... in the game, after black covers, I'd expect white to live underneath, but giving black the wall is awkward. Through
white's upper left corner has been damages as well.
feels a bit like trying too hard, but after the left, things are tougher. White could also have split the right side and made the right star point need to seek connection. The followup at
is not good though. Black can just connect and hasn't suffered much loss while one or the other of white's stones will look pointless.
At
black should cut instead of saving the one stone.
After that, black plays small and aji-keshi moves in endgame which white is happy to respond to or take advantage of. Basically, black built a lot of thickness early and then failed to use it or even try to make territory from it.
the game proceeds sedately, with a few mistakes.
I would play D5. This aims to come out with F5. 
cause losses, so it would be better to try to escape first. Escaping could cause the group on the lower side to be weakened; but White at N3 is a defensive resource.
seems slow.
at S6 is also instinct. Black is playing heavily, and you can do the obvious thing to disconnect.