Take it to hotel.

You step off the train, leaving the painting behind. The doors close, the train starts to pull away, and you watch it carrying away the forms of two heavily-built thugs methodically checking each carriage in turn. Phew! Looks like you gave them the slip.

You nevertheless don't dawdle the short distance back to your hotel, and soon you stand outside.

You can:

Stride confidently into the hotel and go straight to your room.

Ask the people at the desk to store the painting in a safety deposit box.

Take a seat inside and examine the painting in a good light.

Stagger to the bar and demand alcohol.