Aww, thank you!! A lot of the techniques I use are less about skill / savvy and more about the time you spend on it. If I had some links to give for tutorials I’d gladly share, but I mostly do things I’ve picked up over years and years of using Photoshop. I do like browsing http://blog.spoongraphics.co.uk/ from time to time for their tutorials, however!
Without going into a huge step by step here, I’ll just say that I usually always lasso out my subject onto a new layer, and then Gaussian Blur the background. From there I could draw on more hair or whatever else it needs to seem less pixelated, play with the Curves and contrast sliders until I find something I like. I often google for textures and overlays that I can put over it, set on Screen. If there’s anything in particular you want to learn how to do, I can do my best to explain it at length!