The truth is that, at this point, you have a path into several different conversational lines. My choice here, though, would be to continue with the theme you just established. At this point, your connection with this girl (and, to be frank, that’s the most likely person with whom you would have started a conversation) is tenuous at best. You need to follow strong while resisting anything looking like too much of a non sequitir. Remember, at this point, you don’t know what she likes, what she doesn’t, or even if she has a full command of the English language. Don’t worry, though, there’s plenty of fine ground to use here.
So as she waits for her drink, you still have an opportunity to push for solid engagement. The drink in your hand gives you the opportunity. Put the Bass on the bar, and take a look at it. “Huh, I wonder if this was what Manet was doing when he got the idea for it.” If all goes according to plan, you’re now getting a blank stare. Two variations here. One: “Well, do you think he painted A Bar at the Folies Bergere after hitting on a girl there while

Not the most inviting look a bartender has ever given the crowd
drinking a Bass?” or two: “Do you think he actually saw a couple of Bass at the bar of the Folieres Bergere and then went home to paint A Bar at the Folies Bergere?” In either case, “You know the painting I mean?” If you get a no here, then reach for your internet capable phone (everyone else at the bar is doing the same, so you won’t look all too out of place) and pull up the painting “See over there on the bar (lower left and right hand corners), bottles of Bass ale. It’s got to be one of the earliest cases of product placement, though I wonder if he got paid for it.”

Truly the bees knees way back when