I'm not confident that I can write a comprehensive guide, but sure, I'd still like to try and contribute written content for the 1.2 user manual. Things a little busy right now between work, personal art projects and holiday preparations though, so I can't say for certain how much time and how often I'll be able to work on it. But either way, I'll submit whatever I finish.
Does the content need to be within the Wiki pages at Github, or should it be a downloadable .pdf file like the one I linked in this topic? I'm more comfortable with the latter, as I don't have any experience with Github or managing Wiki pages yet. Alternatively, I could just send what I've written as a .pdf/LibreOffice document so that the content can be copied and pasted to the Wiki.
And I'm glad you like how MyPaint-Tan looks here. I just followed some general ideas like the blue and light/dark brown color theme based on the icon. And it seemed like a beret and some kind of apron/overalls is a common theme with other artists' versions. Her design could be refined in the future, so I'm open to suggestions.