An artist repeatedly prepares new mixtures while filling and each section becomes slightly different. What would have been the correct plan?

Correct answer: Prepare enough colour for the entire area beforehand

Uniform filling requires consistency in both hue and dilution across the whole area. Preparing a sufficient quantity of the mixture beforehand allows the artist to use the same colour and paint consistency from one section to the next. Therefore, option B is correct. Making new mixtures invites small hue differences, continuously adding water changes dilution, and a dry brush does not solve inconsistent colour preparation.