@KruleBear:
Thanks man! I try to spend time to get the eyes just right (or as close as my skill allows) because they are really "make or break" in whether the model ends up looking a bit like a person or just like a plastic figure with paint on.
@WiredSternum:
Thanks for the compliment. It's sometimes difficult when you don't feel confident to start some minis, but you know the only way to gain that confidence is to paint the minis and practice. Just go ahead and start. Since the set has two identical sets of Kobolds and Ogres I'd start with painting one of those sets. If in the end you feel that set is much worse than the rest you'll only ever end up using it when there are more than 4 players anyway.
I undercoat everything white and have done for a long time (except I actually undercoated three models black yesterday, but that's a different story). It's so easy to get a solid black area over a white undercoat, but it's all but impossible to get a really nice bright yellow or white or even a bright red over a black undercoat. At least it takes a lot of effort to get right.
That said, if you're not a seasoned painter black undercoat sometimes hides your mistakes a bit better. I'd actually say it's ok to paint the first set of Kobolds over a black undercoat, then if you feel they're a bit too dark, try painting the second set of Kobolds over white. After that you have little experience do decide for yourself what you want to do with the dragons and the heroes.
As
Bloodshovel said, these big flat faces don't really need as much shading/highlighting contrast as you might be used to from GW or similar minis. For the eyes you need to look at anime eyes, as already stated, and see how the colors are used and get an idea for what you want. Then you just need experience with how the paint flows from the brush and how to control it, in order to be able to get those colors in the right places.
Water down your paints a bit, if you're not already used to doing that. These big flat areas will not be very forgiving if your paint starts to roughen up too much.
Progress:
I did some fixing and finishing last night.
Black noses on the bear and bear hide. Finished the second Boo Booty and the Dragon Spawn Point. Also fixed and smoothed out the Dragon's skin a bit, though there's nothing specific to photograph there, so I just left him there in the background.