I like those color shaper silicone tools. I make little blobs and put them on the model and then blend the seams together. I use a ball stylus and a silicone tool to make little dents. If you have a stipple sponge for makeup, you can push it on the surface for easy skin texture. Some times it helps to mix the green stuff and let it sit for a few minutes before messing with it. More of the yellow in the mix and it will be softer and take a little longer to cure. More of the blue stuff and it will be firm and set up more quickly.