Mr.B vs Art Opinion

On my way to get an art opinion...
I am ready to give up... to go away and never show anything to anyone...
He appeared from nowhere and took a look at my "dossier".
Then he stopped at this one: here.
He was taking a closer look.
When Mr. B expressed his interest on buying it, if it was for sale...
I felt embarrassed and ashamed.
"No"
...
He didn't insist, just melted that it was worthy.
"I have given it to my sister, it's her call"
"Tell her it is valuable work"
...
He didn't insist.
He took out from his pocket a gadget.
...
It was a stamp, with his name and personal info.
Asked where his metro station was.
At the stop. He vanished.
...
I felt burning.
...
Than I took my art opinion.
...
What was the word?
"Sympathetic"
...
It wasn't bad, but it's not enough...
Not for me...
...
I felt disappearing.