Illustration pricing

A client is asking me to digitalize an already drawn and painted illustration. They want a pricing. Does anyone have experience in this area? It is not super detailed, yet it is not simple either.
Any advice would be a big help. Thank you

Can you figure out approximately how many hours it will take and get a rough estimation based on an hourly rate? It is very difficult to give a price suggestions without seeing what is involved and how complex the illustration is etc. Is it something that can be image traced, or has to all be done by hand?