These are my games from this weekend's tournament. Sadly I don't have records of the games I lost, it would be much more instructive to receive criticism about them. I lost two games at Saturday, but suffering of horrible lack of sleep I couldn't record or remember them. One of my games was short enough to remember, and other one was (humiliating enough) broadcasted at KGS so I have the sgf. My boyfriend friendly deleted the kibitz, because I didn't want to see the comments. (I couldn't care less about strangers' comments but I am rather sensitive about what some of my "friends" say in kibitz mode.)
Please mostly say things about my moves, since I'm the one to learn here.
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sm1r5.sgf [2.59 KiB]
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sm1r4.sgf [651 Bytes]
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is bad shape, it should be at O15. If black escapes to P13, there is a push & cut variation at O16 that is complicated but seems to work.
R17 is better, then the best white has is a two-stage ko, see: 
Blunder, as you satisfactorily showed 
I would prefer Q12 to take sente and move to another part of the board.
O13 looks much better.
Too eager. Black should hold off and let white worry about this group.
Overplay. White can play elsewhere or defend the cut.
Black should play R12 immediately
What do you do if black plays S14?
Defend the cut in the center!
Overplay
A disaster for white.
If black plays J2, white's center group dies.
in response to the invasion 
is a common beginner mistake. White wants to capture black, but the shape is too weak. With the push at a and the attachments at b and c, black can manage easily, and white usually ends up with a wall with defects.
, but with 
on one of its vital points, later the invasion a on another vital point will expose the weakness of this kosumi.
allows her to cut black, but the kosumi shape is too weak. After 
black cannot avoid either 
or 