Adsense/Youtube questions about video content

I would like to know exactly what kind of videos are acceptable for adsense/youtube.

I wanted to make slide shows, using really attractive thumbnails to get more views, but I don't want to use the wrong kind. Here let me give you a few examples of what I'm talking about.



Now we all know what this image looks like, and that's part of the reason it has more than 24 million views. Would this get you banned from adsense. I mean it just a tree actually.



Here's another pic that seem to be on the border of acceptable/unacceptable.


As we all know sex sells, so having pics like this as your thumbnail is sure to increase your views, but will this be considered deceptive methods by Google.


Just as a experiment I placed a video slide show on youtube sunday, with a sexy pic as the thumbnail an it has gotten almost a thousand views so far. I have not associated that youtube account with my adsense account yet though.

Now my other option is to go the weird/funny route. I placed a slide show of a weird picture on youtube but it only got 8 views since sunday.


These type of vids also receives plenty of views but it seems to be more hit and miss than the examples above.






All of these videos have more than a million views, mostly because of using attractive thumbnails.