It took me looking at this a couple of times, but she's not evening in a swimsuit – she's in her underwear! The idea of this beautiful woman running around in such a public place in just her underwear is very cute and sexy.
It seems like your work has only improved over the years, and this may be your best piece yet. The shading is just phenomenal. Like others have already said, it's genuinely hard to recognize it as a drawing, rather than a 3D-render.