You can't really make colours look unique as such. I suggest looking at someones models you consider 'good'. Attempt to work out how they have done certain things you want to mimic. Take a look at it under a magnifying glass if you have to. It also depends on what you paint, let alone what paint you are using. Most paints need bright colours, like red or yellow, to be built up from a lighter colour, like white. With red, I start at Brown then build up to red slowly with Highlights and layering (leaving only the darker, more shadowed areas showing). All I can really say is, remember, this is a model, not a canvas, you need to really exaggerate the shadows and highlights, if you dont it looks too flat and not 'realistic', although a neatly painted model, IMO is a well painted one. Also, read other peoples painting articles, I only got where I am now by reading and copying old GW painting guides. I wouldnt suggest their new book at all. I would suggest looking for the old 'eavy metal guide, but replacing the white undercoat with black (unless you like white undercoat, of course. I just find it hard to master).