The Mausoleum at Halicarnassus

The Mausoleum at Halicarnassus, tomb of Mausolus built by his widow Artemisa.

Engraving by Philips Galle, after Maarten van Heemskerck, 1572
This picture strikes me as very weird and that's because of the focus on the big guy's butt. He appears to be wearing some sort of raggedy shorts or skirt but it must be clenched between his butt cheeks to display his butt like that. Unless the cloth is see through. Why would they put such a focus on that? Could the lines of his crack have been added later? The gal holding the umbrella has her breasts shown even though she appears to be wearing some sort of dress that goes up to her neck. Also weird that there is no sleeve or end to the sleeve on her left arm. Maybe they're supposed to be wearing some sort of see through silk?
And no, I don't believe any of those statues were created by guys wacking on blocks outside on the ground without even a work shop. I am down with the giants theme though, unless those are twelve year olds chiseling the statues.
Interesting that the big guy has a right-angle square in his left hand and I'm guessing those tongs in his right must be a compass. Free Masons again?