It's got be "no diving",along with "no swimming,no laughing and definitely don't enjoy yourself".

I've just moves Graham's images/challenge & the associate guesses to this thread as its a proverb... but I've no idea what the answer is :(

Good. Now the puzzle is more clear though not much change about the answer!:)

How about:"You can't cross the sea merely by seating and staring at the water."

The clue is the man and what surrounds him.

wet behind the ears
or
Don't make waves

When a man is crossed out ...does become 'no man' ?

haven't heard of that one Graham.

Me neither.
Also listening to Graham's hint I was totally gone with the unusual clone and mask of periphery, cost and surrounding of image... Would not even guess that in seven life.

Any how who is the next for new puzzle? now that Graham gave up on us!
I have one ready and if you don't want to go Trena, let me know to add a new Proverbs puzzle.

go ahead Sassan, I have nothing at the moment

I thought Grahams comment was a clue rather than an answer. Maybe his one could be "no man is an island"?