I can understand. It seems like this was a spur of the moment thing (not to mention your first time), so some things won't be perfect.
The fact that you put yourself out there for critique deserves respect (the internet can be a big, scary place) and implies, to me, that you're willing to improve.
Photography's great, I studied it for awhile too. One of the best things I learned was how to receive (and hopefully give) good, constructive criticism. There's a ton to learn in any art form. Bad critiques can really ruin someone's day (not to mention their desire to learn more).