Mike,
Your beard is looking excellent. Your cheekline looks good natural but if you want stronger definition you could trim it slightly. Just be very careful. In my case, I began carving a cheekline when I first grew my beard but eventually went to a more natural line only trimming a few hairs higher on my cheeks . A natural cheekline is definitely less maintenance and I like how it creates more of a natural blending of my beard with the rest of my face. I also discovered that my natural growth pattern on my cheeks balanced better than I thought it would when I gave it a chance. Whatever you decide, it is really just a matter of preference.

We live as though the world was what it should be, to show it what it can be. - Angel (Season Four)