SoftSkin Photo Makeup isn't anything extreme... It's not terrible software to use or install, adding a single "SoftSkin Photo Makeup" folder that holds the program's files. [Didn't record *Anything* like the mysterious updater that Richard Sebire posted (#2 comment).] As far as the registry goes, there's a new key for uninstall + a new HKCU\ Software\ softorbits\ SoftSkinPhotoMakeup key. If you read the software's readme.txt file you'll see it was tested with, & presumably designed for "Windows NT 4.0 Service Pack 6, Windows 2000 Service Pack 2 and Windows XP operating systems." That might explain irene's post [#3] about having to run SoftSkin Photo Makeup as admin for the app to show registered -- I've seen this on a few apps that weren't designed for Vista or later.
The software itself has a simple, easy to use interface, with a basic spot remover, auto image correction or enhancement, & a few paint-on tools. You can make a relatively crude selection, which you'll need for the smudge filter for example. Based on the ad copy up top ["... you no longer need to apply numerous layers in Adobe Photoshop."] My Guess is that it's targeted for the user who wants something hands-on -- as opposed to apps where most or all adjustments are automatic -- but doesn't want to bother with any sort of learning. That's not meant as criticism -- there are plenty of things I have little or no interest in, & I don't spend a lot of time learning anything related to them either.
So in a nutshell, SoftSkin Photo Makeup is very useable, & you can edit & hopefully improve the head shots you've taken with your camera -- I stop short of saying portraits because to me there's a real difference between a portrait & a snapshot of someone's face, & I don't think anyone is going to use today's GOTD for minimally serious portrait work. If it has a weakness it's that much [most?] of its intended market takes pictures with their cell phones, using the filters either on their cell or on the site they upload their pictures to. There's much better software available, but it takes time & effort to learn how to use it, and SoftSkin Photo Makeup doesn't seem designed to compete with those apps anyway.