You can have too much detail, too.

Hallerbos, near Brussels, early May 2013.
Later that day of the three previous finds, we got to visit this beautiful bluebell forest near the city. (Note the blooms in the background.) And also found a lot of signs telling you what's forbidden, including this curious attempt at asking people not to leave the paths.

Now, the basic idea of picture signs is that you get the idea at a glance, even without words. A person leaving the path crossed out would've done the trick well enough. However, it seems what they wanted to get across was: "We understand you might want to take photos and in your enthusiasm you might not notice where you step - but, please, even for only a photo make sure you stay on the path!" - Which is a nice enough thought, really, but the result is, without the words ('stay on the paths, please') in my opinion it looks like it's saying "no photography!". The top left half of the sign, with all its interesting bits about the guy taking a photo, distracts the view from the important bit, which is the guy's being off the path.