The skink priest is really good, I can see some nice shading on him. The others appear to lack the same level of shading as the priest has though. Repeat whatever you did for him and they will look good.
You use washes I assume? All you really need to do is get a layer or two of wash onto the models and they will look far better, its very fast and easy to do. If you want to go one step further, give them a bit of a highlight on the raised areas with a lighter tone before adding the wash. That will work even better, but will obviously take longer. I don't recommend drybrushing with LM, it never seems to work well, however, you can be fairly rough with the highlight mostly by using a fairly dry mix (not much water added) and not loading too much on the brush at once, then brush it over the raised areas to get paint on them. Follow that up with a wash and they will look good.
Let me know if you want me to go into any more detail on any of the techniques I mentioned. Otherwise, they are decent keywords to google, there are loads of really good illustrated tutorials out there. Good luck with them!