For your first time, that's not bad at all! I would be THRILLED if I could do as good a job as that myself. I can do pretty much everything to my hair - my own cornrows, box braids, twists, sets - but I cannot press it straight to save my life. I go to the salon for that. It's hard to get enough tension yourself when your hair is really curly/thick/coarse.
I think what you did looks fine. If you wrap it and cover it with a scarf tonight or set it in a few big rollers, it might smooth out a bit and look great.
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali