I take screenshots at the beginning and end of each day's modeling to log my work hours (I do intend to charge clients an estimated fair hourly wage for custom 3D model commissions in 2023), but for real, I wouldn't be able to keep up this amount of sustained effort in so few an amount of days if it wasn't a character I was itching to run around as -- one at whom, partway through each day's work, I spontaneously clap my hands and say to myself "Oh my god. Look at her, she's SO pretty. I love her, I'm LOVE her--"
