You can use a dry fan brush to gently sweep out the excess paint from the creases.
I think I know what your talking about if it looks “dry” I pounced a thin layer of thinning medium for my last layer and that seemed to help I think some of the ladies use the heat set glazing medium mixed with the thinning medium as well. Hope that helps.
The mottling makes a huge difference too. It really brings the the skintone to “life”.
I think once you begin to add more layers of colors with the creases, blushing and motteling it will begin to “liven” up a bit more.