12: Disgracefully unimaginative. Think bigger, jump to Q18! It isn't like black can cut that shape, and it eats more of the corner.
18: Pushes to the centre, but now if black plays C2 he eats most of the corner! If you play C2 yourself, you get loads of territory.
20: C2 is still super-great. Your move looks like it's in a big area, but black can just play C2 to make his group strong, and then K3 looks like a fairly lonely stone.
22: Makes a base, but asks black to play F4 which is a powerful separation move. How about playing F4 yourself? If black tries to separate you, you can probably cut.
26: Another big area, but the C2 area is more important than ever. Black can even aim to play C4 now, because you made him strong! This is a symptom of making a weak group on the bottom unnecessarily, rather than just making your own corner strong and attacking later instead.
30: Q17 is better. Convince yourself of it.
32: Looks like a big empty space, but your move feels a little aimless. Perhaps it is more interesting to protect a specific weakness such as the C4 area. Something like P5 may also be good, to try to settle your groups.
38: Rubbish! The monkey jump can be a good way to remove eyeshape, but it rarely has value when the situation is so unsettled. For instance, black can just play K17 and you can't stop both the L18 and L16 cuts. Even if white didn't have this weakness, black can easily jump out so he isn't really affected by the minor lack of eyespace on the side. Save the monkey jump for later, just connect to the peep.
46: Crying after spilt milk. You are trying to remove eyes on one side, but have forgotten that black is stomping through your stones on the other. Protect your weak group at K17!
Edit:
The way I usually play is to avoid fights and go for moyo.
1) For maximum improvement, try to get out of this mindset. Put frankly, most of your moves are rubbish and you aren't qualified to judge them by style. Nor are most people, but that's no excuse
. Do your best not to ever think 'I won't play X, it isn't my style' or similar, and just try to find the best move. Even if you think there are multiple good moves, try different plans.
2) A moyo game in the normal sense generally naturally leads to a fighting game. By nature, a full moyo is undeserved territory, because it has holes in. If the opponent doesn't exploit the holes, he probably can't win by making territory normally, so he has to try. But then, in turn, you get to attack his reductions, or your own moyo won't be enough. Whilst you may not find this to be true, that's probably mostly because your opponents haven't get grasped the necessity, and you can't avoid fighting even by pretending to have a moyo style. It's also another way to look at point 1; that you're judging things for the wrong reasons, and should maintain a healthy understanding of your own lack of understanding.
