I agree that it appears to be quite a lot of drybrushing. It also appears that the color drybrushed on as a highlight is a HUGE jump from the base color with nothing intermediary.
Instead of highlighting with the drybrush, start by learning to layer. Layering is applying several layers of color on top of one another in small steps up or down the lighting ladder. For instance, on your top guy there, use a flesh color as the base.
When you go to paint your base color, thin it about 1:1 with water. It's okay if you end up having to paint two coats for smooth coverage. Then, get a highlight color. Say, bleached bone, for instance. Mix it 2:1 Flesh/bone and then 1:1 Flesh/bone and then 1:2 flesh/bone. Thin each to 3-5 parts water per 1 part paint. If you want, you can dilute straight bone for your final highlight but use it very sparingly.
These are your successive highlights. Start by painting your original color over the washed base on the largest part of the raised areas. Then do that again with each successive mix on smaller and smaller areas, focusing each highlight towards areas that would receive the most light. If you diluted well, your layers will be partially transparent, so you can paint each one twice, tightening the area painted each time. This will give you somewhere on the order of an 8-9 step transition.
It'll take a little more time to accomplish, but if you do it right, the small steps between colors will give the illusion of blending or gradual transition and eliminate the chalky look your minis have now. Get layering down and then you can actually focus on true blending.
Baby steps.
BTW, I'm diggin' the eyes on the top guy. You did a good job giving him expression through the half-lidded look. Eyes tend to be a tough spot for people and you seem to have a pretty good way with them.