Everything you have looks amazing so far and especially when you have them together like Perdita's army (papa on the cactus is hilarious). And the executioner is incredible.
A few tips and pointers I can give you (though I'm an extremely slow painter in comparison to this lol).
Try to thin out your highlights a little more and do it in numerous coats (especially with skin), on some of the models the highlights come off a bit harsh in contrast to the base color. However for things like leather, brighter, reflective looking highlights are actually what make it. Google-ing black leather, while dangerous I agree, can actually help so you can see how light hits it.
For basing, try basing by hand a couple times. I know it's slower than spray priming and then washing it with black, but I've noticed between the two I lose so much detail when spray priming, and I can thin and control my paint as much as I need to. What's nice about hand basing too is it gives you a chance to get your hands and eyes everywhere on the model before you even start giving it base colors. I use bleached bone for 99% of my models which also helps for a base face color to work off of. (Excuse the giant image but http://i.imgur.com/vx1k5.jpg all the bleached gives you an idea).
The last thing, and I don't know if it's the camera or lighting, but your models come off a little bit shiny. If that's the effect you're going for by all means keep it. Personally I slap on 3 or 4 coats of testors dullcote to kill any shiny my washes leave.
You can definitely see your improvement on every model you're painting and I'm sorry this post is like rant worthy long lol I hope a helps you even a little though and I can't wait to see more!