This one is not for the weak  9 out of 10 difficulty 
My wife has been doing this for years and usually can do a 1,000 pc. Puzzle in 3-4 days. So far, it has been almost 2 weeks and she is now about alittle more than half way done. As the toughest puzzles in the world are 1 color and you have to rely on shape,  this too offers that feature of difficulty. At least this does have a frameable worthy picture,  the mysterious cats eyes. 
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