The beard is looking really good, RedDawg. No reason why you shouldn't establish a cheek line now, although I see no pressing need to do so since you have very few stray hairs above your natural line. However, if you want your beard to have a sharper look then a lightly carved cheek line will help; but as Dano says, go very carefully. Also I think that it might be a good idea to tidy up the neckline, unless you intend to go "natural", in which case a cheek line would not be required either.

Keep growing. Stay bearded!

wulff