Okay, maybe the 'two colours' thing was a bad idea. I just like the colourful ones.
As for the sentences; I will allow long sentences, but it's usually best when it's less of an accurate description and leaves things open to the 'artist' to draw something crazier.
When you're writing, it's probably best to try and be funny rather than accurate. Try and get a sense of what the people in the picture are thinking... or something like that...