Irenika worships her foot (Patreon)

Finding a way to add wetness to just this specific part of her body was for me, worth the trouble of figuring out. You can only adjust the texture settings on large surface areas of the figure: arms, legs, torso and head. You can, however, make individual parts invisible in DAZ, right down to her knuckles. So I duplicated the figure, applied wetness to the legs of figure 2, and then hid all of figure 2 except her feet. I then hid figure 1's feet. Presto! Wet soles! 

     You'll notice the lighting here is better than in most of my renders. Well, I've had a colleague harping on me to only use HDRI (the dome that surrounds the entire scene) for lighting. That works great if it's an outdoor scene or if there's a big window nearby, as is the case here, but bad advice for purely indoor scenes.