Can someone help me to understand how to improve the points in that game?
Thank u very much
Hi, I think the upper right white group is not settled and could be attacked at J7 (even at the end of the game) I am not 100% sure, but I think you could get a ko out of it and seeing that white has no real ko threats, it would probably end in seki and you would win.
I will try to put together some analysis to make it clear.
EDIT: The analysis should be now visible at the game. Again I am not completely sure, but if I am right, the mistake you made was giving up too early 
@Adam3141 interesting comment. The full analysis of the top right corner position can be found here:
http://senseis.xmp.net/?WalkieTalkieSeven
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