Dodge and Burn: by lightening and darkening the shadows and the highlights you change the form and the appearance of the subject
Check Layers: they help you see all imperfections of the skin better
Frequency Separation: this is technique which separate the texture of the skin on one layer and the color on another. This allows you to improve the skin without losing quality
Halo Effect: this action will create strong vignette, will bring contrast and depth to your images. Mainly I use it for portraits on which I put textured background.
Toning: my pack comes bundled with 6 toning presets 3 warm and 3 cold. As bonus you get a PSD file where with one click you can see how your image will look with the toings.