This video shows the full two hour process of painting a yellow lily in watercolor. The flower is tightly rendered, and the video leaves out no step of the process. Here are the links mentioned in the video:

Udemy Course: Paint Realistic Watercolor Portraits
https://www.udemy.com/course/paintre...

Our Website: http://watercolorguru.org

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Video by Anthony Pfohl, Jr. and Maxwell Pedersen.