This picture is awesome. Problem is puzzle is tedious because of all the single squares. The greys and black are so similar I ended up having to use the option left click on number to get colour and just continually clicked along lines - no thought required. Glad I solved it for the picture but wouldn't recommend it for the puzzle itself
I really wish I'd read the comments before starting. lol It is a very beautifully detailed image, but I agree completely with MEisHERE and TIncan - it isn't worth the time and tediousness. The blacks and greys are too close in color, and there are so many single color changes. I wish someone had done this for me, so for those who don't want to complete the puzzle but are interested, the picture is a Rottweiler (dog) .