With pleasure.
While playing your map, find a interesting place/view, and hit F12 to make a capture.
Then you get to your map on the worshop, choose from the right menu to add snapshot, and follow the instructions.

Hello, can you tell me how I can change the picture? I do not know how.

Hi there! this would be fine if:
1. you don.t show us the hidden cube in the picture above
2. you would reverse the laser emitters, so we can see the signages
3. please had a dropper for the cube
4. a way out from the upper part, so the tester would not get stuck doing the wrong portal
When RESTART is the only way out or to get a cube back, that's a design flaw.
Please try one of mine . Thanks.