The trick with oils is very little goes a long way. Put a few spots in key places and then spread them out with a bigger brush. I personally paint with acrylics to set the basecoat, highlights and shadows, and then blend them together with oils. The oils add the same shade to all colors bringing them together (I use oilbrushers flesh for example) and then you can add red for lips, grey for 5 o’clock shadow… So acrylic basecoat, layer of oil to bring it together, then details in oil blending with the previous layer, and go slow, you can always add more color. Then leave it for 3 days to dry…