The crease of the two forearm muscles is a bit to pronounced and long on the front of the arms. It's a bit distractive, and not too feminine(even for a female with giant forearms).
I would use vertex painting for this. Avoids the need for a second UV, and another texture for the mask. Plus it can be unique per building, without adding a new mask texture for each building. I haven’t used Unity in a while, but it comes with a shader editor I think. There have to be a lot of tutorials out there for how…