Um, I can do you some general feedback for all your stuff, but I don't know if it'll be pretty...
First off, I don't usually mind cutting corners with spelling or punctuation with posts as you can tell what someone is trying to say, but all your posts on here are so completely unformatted that it's almost impossible to read them - especially if it's more than a couple of lines long. I wanted to just ignore what it said but seeing all of them I thought I'd comment to try and make it easier for you to get feedback on your actual work or a response from Jak on your suggestions.
So, characters: almost everything you've posted here are just recolours of the default girls? Berlinda is just the default Layla with Shauna's hair and some tweaked breast proportions, which you can easily do now with the hair and breast customiser addons, as is Jada Fire but with Ulani's hair? Ashira's white eyes are pretty cool, but otherwise she's just Shauna. Red Devil and Night Elf are just default skin with a red or purple paint tool tipped over them.
The only one with some interesting potential is the spotted leopard girls, with the extra eyeliner and spots, which reminds me a bit of Jak's blue alien girl, so you're getting better, but it's not really worth posting something that you can make with a brief change to the texture or xml file.
So, what I'm trying to say here is, look at some of the other guy's custom characters, particularly Doberman's slightly sweaty/shiny and tattooed skins or Sekse's excellent Tron characters, or oncesailor's more subtle texture alterations for particular features, pick what you want to make that will stand out from the default characters already available, like the purple leopard girls, then focus on that to make a particularly special character. Even with simple tools like MSPaint you can add distinctive features to a skin and make it look special, although of course the better the tools and the more work you do the better the result.
So, to summarise, more punctuation and breaking up sentences so we can read your posts, and make a custom character for us to download something special and appealing rather than just a tiny simple change that we can do with the in-game customiser tools.