https://www.patreon.com/dandonfuga
Images from July 2020 onwards.

Part 1: https://e-hentai.org/g/1610909/a42168a85f/
Part 2: https://e-hentai.org/g/1733508/88fa189244/
Part 3: https://e-hentai.org/g/1830690/3a03f2fada/ (here)
Part 4: https://e-hentai.org/g/1902331/05f7f6320d/
Part 5: https://e-hentai.org/g/1910064/a28ea9373f/
Part 6: https://e-hentai.org/g/2034354/e092a4b877/
Part 7: https://e-hentai.org/g/2037524/e258b75a75/

It is suggested that you look at the "how to" steps the author included with some of the images to see how a sketch becomes the final character illustration. Of note is the one for Tina starting at image #1039. You see a sketch and also shown is how the bikini design evolved.

Base +20, provo26 +1