Paco, you have a great capture here. I would never imagine that you had an unsuitable lens for this shot - the photo is great. With that smile and that look in her eyes, I know why you wanted to photograph her. The fact that she's partially hidden serves two purposes; we can see that this was an unposed photo, and is all the more natural for it; and second, the bits of people on the sides of the photo provide a context that helps the viewer imagine more clearly the place and situation in which this shot was taken. Great work, it's going into my favourites.