Adding hair using cloning is difficult, because as you say...it looks cloned. It looks cloned because there is a texture and our eyes are excellent at seeing a pattern.
I'll give you a couple of options to consider:
You can use the liquify tool to reshape hair. Go slowly and do this in stages using the freeze tool to keep hair you don't want to move. Bloat and shrink can be used to make hair "poofy" or flat -- and even appear closer or further from the camera. The forward warp tool can add curls or shape where you want it.
Here is a sample (please don't critique the coloration of this sample -- it's an animated GIF, which isn't the best choice for a photograph, but was the simplest way to show you an overlay of before and after). The image shows before for 2 sec and then shows after for 2 sec and repeats. There's no need to click it or hover.
It might seem daunting, but take a page right of of the fantasy artist's book. Find out how to draw realistic hair here: http://www.elfwood.com/farp/theart/g...eyenihair.html
-- of course, to get your colors, you should sample the model's own hair. (If you are looking for a highlight color, take it from the model's highlight color.