Do you think it was okay that I looked at a model's boobs a few times while we were playing pool?
There could be. Was there something about the model that kept you looking?
Yes, I thought she was a perfect 10.
While it is fine to consider a woman to be attractive, it isn't okay to keep on staring at that woman's breasts in public. Staring at a woman's breasts is rude and uncouth behavior and should not be done since it makes that woman feel objectified. If you can't stop looking at a woman's breasts in public you should get help from a behavioral therapist to find ways to curb your voyeurism.
I'm just looking! Next time I will discreetly make a picture of those boobs and save them it in my phone so I don't have to keep staring at her.
That would also be bad. Taking pictures without consent or staring at a woman's boobs are both objectifying the woman. You should respect her and keep your eyes to yourself.