It is not the client's responsibility to correct the artist's technical errors, not every client understands art or will notice these types of errors before seeing the finished piece. It's incredibly disrespectful to pay a high price and still have to ask the artist to do the bare minimum, which is to finish the piece with the same quality as their previous works. Especially when the person admits to having seen the errors and simply not having corrected them because the client didn't ask for them to. The lack of respect for the customer is obvious