For me, billing is based on the work. The fee is based on previous experiences. This includes hours worked and difficulties.
"I also require information on the person who owns the painting. Sometimes a contractor will need to take a damaged painting that they have done inside an apartment.
They might not wish to share this information with their owners. This could pose a legal or ethical problem.
"I also inquire about the materials and artworks that are used. Are they aware if it is acrylic paint, oil paint or both? I would like to know the name of the person who is responsible.
If you can, the name of the artist.