What does a boy mean when he says your Pictures Nice?

I think you could say nice for Sooo many different things, like he could say it because he has nothing ealse to say.
He could have also said that because he thought it was a nice picture.:)
It all really depends.

Hope that helped a bit. Good luck.

For me, I think he just being gentleman and want to appreciate you and your gesture. Do not think about it too much. If he said more than nice, then there is something that he sees in the picture. Typically, he is just appreciating the gesture.