Totally agree. Luckily the pattern was extremely regular, so I made myself finish the black first so that all the rest of the very very dark grey would be obvious. After I got all the black, it was a piece of cake
The colors black and dark dark grey were WAAAY too similar (which turned this from an average to a difficult puzzle for me - until I decided to finish all the black first, which made the res6 a snap!)…but other than that, what a gorgeous image!!!