Very nice picture. However, the different shades of blue are very difficult to tell appart, leading to always "check the crossword" just to see if you have the right blue in.
My laptop is set to mute colors slightly in the evening and two of the blues became indistinguishable. This morning it was a little easier, but still hard. The result was great, though. Just a hard puzzle because of colors being so close.
I could distinguish the 3 colours of blue, but it was difficult to know which one was needed in the puzzle. Had to do it block by block. The result is excellent though!
Good picture but very bad nonogram for two reasons. 1. As the others said, there are 5 shades of blue, including 3 very close shades of dark blue, which makes the nonogram difficult for a bad reason. 2. Loooooooooooooots of 1s and 2s, which makes the nonogram tedious.