Can the tattoo artist change the price of a tattoo after starting?

Hello, the price of a tattoo is very difficult to determine in advance. Some artists offer ready-made designs in a certain size at an approximate fixed price. However, if the design is individual or the tattoo takes longer due to skin conditions, frequent pauses due to pain, etc., the artist can of course adjust the price. Tattoo artists usually calculate in hourly rates and base the final price on their working time. It is best to agree on a price range with the tattoo artist before the tattoo so that there are no unpleasant surprises.