OK guys, I'm back for some more advice. The contractor had the plumber install new pipes on the inside too. And he made one decision we may ask him to change. Before, the sink was centered under the window. But he had the plumber move the pipes a few inches to the right, to center it between the tub and the toilet. You can see where the drain pipe used to be, under that small piece of wood about six inches left of where it is now:
Would you center it under the window or between the tub and toilet? It's only a few inches, so not a huge deal. But it might bug my wife and me.
Another thing to consider is whether we'd want more room next to the tub or next to the toilet. What do you all think?
Below is a pic of the outside pipe I took for @Numbernine. Sorry it's a bad pic. Couldn't take a pic outside, since there's scaffolding there, and the electricians were working, so I just quickly snuck in and stuck my phone out the window.