When it comes to apex predator fish the snakehead has created a lot of mystery and even terror in some regions. Here in North America the snakehead can be an absolute menace and displace or even wipe out native species. However there are regions where the snakehead is revered as a trophy fish of magnificent proportions.
Alvin Lim has captured some of the most amazing specimens of this species that I have ever seen which adds to my respect and awe. Generally the snakehead I have seen (on the Internet or TV of course) have been dark with no markings whatsoever. These examples are superb. I highly recommend checking these guys out.
I will toss out a few Wiki leaks for additional reference (really I am just being lazy).
Good luck and good fishing.