Thanks for all the feedback. Here was my thought process for each photo:
For 1 - I shot it overexposed and bumped it a little more in post. I really wanted the focus to be her eyes in the photo, and with the very shallow focus of the f/1.8, I felt the background details did not matter as much because they were so out of focus.
2- I shot this on a bridge with the leaves, because I wanted to give the appearance of outdoors, but still keep the focus on her and the guitar. I could have eased up a little with the vignette, but I like that it gives her a spotlight effect with the guitar. I also opened the aperture up so that I could have more of her and the guitar in focus, but still blur out the background.
Thanks for all the feedback!!