I am at the labatory. I'm trying to locate the painting differences with no success. I can not get an magnifying lens no matter what I do?

Actually I use the pen but she refuses to cooperate

Any suggestions

Thank you

You see the painting you are testing on the table.
Find the similar painting on the group of painting on the stand.

Once you find that control painting - note that the painting you are checking is only a portion of the big painting. It is the portion at bottom right area.

Use the permanent pen on the painting to be checked - this will show the magnifying lens on the big one. You can then move the magnifying lens to examine.
Once you see a difference - click on the original and the painting to be checked will be marked.

If you don't get the magnifying lens - it might be the wrong original or control painting. Flip through and check.

@MaG,

Thank you I will try do that.

@MaG

I just cannot find any lens. I have in my screen the same icons that you have in your walkthrough but without success, where are these beautiful lens hiden, anyway, can I have a saved game after you have solved this particular puzzle.

Thank you

I sent you what I think is the correct files. There are 3 files per saved game.