My way of working is the following and involves 3 phases.
We will have a first contact to explain the idea and see an image of the space to see how to adapt it.
You can provide inspiration images, favorite murals or chromatic range to create the concept. Send it to
Based on this I will indicate a budget that will include the material.
Once the budget is confirmed, we will specify the dates to carry it out and the final details will be discussed.
I will show you the final design before painting it.  An advance payment will be requested that will be deducted from the final budget. 
Creation of the mural:
Carry out the work and payment at the end of the project.