Thanks, BBL,
Hey, Yeah it's a process, as far as the sweat look, try varnish diluted in water and a brown paint mixture (Rory gave me the tip with that, and that really helped me get the natural sweat look. For the skin tone, I actually liked the factory skin color, so basically I've just added some light red washes to the highlighted areas, as far as the smears goes, I can't speak for anyone else's technique, but what works for me is the smear and then wipe off the access or residue but still leave a little bit on the surface of the face and with a paper towel or my favorites q tips, also while wiping the access try patting it lightly with a paper towel, that seemed to really help me with the sides of the forehead, to simulated the feeling of the dripping sweat look. remember go lightly, otherwise the wash might drop to much and stain the factory colors on the skin tone. When you attempt to put sweat on the wrinkles such as right across from the bridge of the nose underneath the eyes. try not to go to heavy at first I went a little to thick on those areas and then it got way to shiny, luckily I was able to touch it up, so take heed on that. Also I guess you can try some flesh tone in a wash to add the more realistic glow, but I think if you just add the reddish to the highlighted areas you can achieve the natural skin.
Sorry I hope I'm not confusing you, by nature, I paint and sculpt models as a hobby of mine, from Plastic, resin, ceramic, vinyl, etc. And I've been working on this hobby along with collecting for 25+ years now. So I developed my own techniques, It's all trial and error unfortunately, but it's a fun process when you take in the results. Patience is the key for me.
Even right now working on the mouth and lips is such a challenge, because of the of the sculpted mouth positioning, I keep loosing the likeness of ford, I know it's been stated that HT screwed up the sculpt on the mouth, but it's not impossible to capture the likeness, but the real trick is trying to customize the look without loosing the likeness in the process.