I have never heard of the word "skint." You would say, "Sorry, I'm a bit short right now."

Modesty is a human feature which is not associated with any educational or living level, but unfortunately it seems that modesty is only recognized by humble people, and those who are full of themselves will never get it through their heads

This sentence is not grammatically correct. You would say "You have a good time, too."

Well, by tomorrow her arrogance will be gone.

I turned back a camera equipment.

I turned back a camera equipment. Journal March 26, 2018

Last week, I got a new camera equipment and I tried it yesterday. It is used to combine a camera body and a lens of different manufacturers.Unfortunately, after I finished setting up and push some shatters, I could not remove lens from the equipment.
Consequently, I went to a well-established camera shop and made them set apart. After I came home, I fulfilled a process to return the tool.

I returned a piece of camera equipment.

Last week I bought a new device for a camera, and I tried it out yesterday.  It is meant to combine camera bodies and lenses of different manufacturers.  Unfortunately, after I finished setting it up and ???push some shatters??? (don't know what this means), I could not remove the lens from the equipment.  Consequently I went to a reputable camera shop and had them take the two pieces apart.  After returning home, I made arrangements to return the equipment.

Who's the man in the picture is correct.

Everyone knows and Everybody knows are correct. The other two are wrong.

You could use a phrase like "Now I'm in trouble" to express that you're actually in trouble. Or, "I'm in real trouble now." The phrase "I am really in trouble" has the nuance of being in big trouble.