Street life.

My latest interest is street photography. The new photography site that me and two of my friends in the club are working at, got me interested in this kind of photography. I use every opportunity to practice.
This is my beautiful friend Freydís, a member of the photography club, she was so kind to model for me tonight. I kind of like the graffiti in the background, what do you think?
I'm thinking of buying a new lens for street photography, any suggestions?