W.Y.
No, not too cautious. A few links, I am sure, are going to try to put third party ad-ware, spyware, and so forth, on your computer. But many seem honest business (mostly in UK) trying to find a way to get a broader customer base.
I went to the 2nd page (link on top to Pixel List) and looked at the list of advertisers, and clicked on a few (maybe 10 or 12 out of hundreds) and my anti-mal-ware only went off on one of the links, which is not a bad average. But I have a good (not best, or great, just good) anti-malware program that I trust. Others may not have it so good.
But I really just looked at the shock of all that color and images and thought of the massive challenge of trying to put a puzzle like that back togeather after cutting it up. I was overwhelmed.
But OT: one of the links is to a shop in London that sells cartoon art:
http://www.lollipopanimation.com/
which of course would make a better puzzle topics for my puzzle making skill level. When I visited that site, they did not seem to put anything bad on my computer.
Phil