Just a few comments on the first corner and fight:
- if you want to counter pincer it's common to jump a 3rd time (though this is a local loss it helps the fight, but I heard Lee Sedol doesn't like it). But in fact with the black top right corner I don't like counter pincer, I'd rather do the big knight move in answer to the pincer and aim to settle locally.
-r3 is good, but r4 is somewhat heavy. Later, depending how the outside fight goes, you might want to s2 to offer a small corner life for getting cut. The time it's clear you want to pull back is when you are going to immediately settle the group (e.g. with the one space high pincer and attach under it and cut, in that case you don't make the 3rd jump).
-b19 was slack, should either r8 and fight or at least cover the cut in an active way with p6 which makes miai of r8 and p5. So for 20 just connect at r7, your 20 doesn't achieve much but his answer makes a nice shimari.
-Ditto 22 and 24, these moves give your opponent points when he answers and make not much of value for you (unless you can kill that black group in the middle! or otherwise find some profit from attacking it)
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