It’s definitely a matter of upkeep and grooming. Trimming, brushing, and styling with oil/balm make a huge difference in making a big beard look respectable instead of crazy.
Edit: And really, all of the above beards look good, for what they are. 5 and 6 are clearly less groomed, but it takes a fair bit of work just to keep a beard of that size from being a tangled mess. From there, unless they’re going to braid/bind the beard in some way, there’s not much you can do – it’s a big (brushed) mass of bushy hair.
1-4 have clearly put some real time and effort into their beard styles. They are very well-groomed.