I can't help but agree with most guys... the raccoon looks like it's hovering, the sea looks like mouth wash, the waterfall trees look like plastic, and the desert highway looks boring and cold.
Anyone that has actually been in a tropical island will tell you that the waters ARE emerald green, and there's no hint of pollution. Also, clouds at sunset tend to be yellow, then orange, then even purple! Turn them all white, why don't you!
On the other hand... if you keep giving people such advice that will make all photographs boring and amateurish, that will really deify us photographers...