I wonder why you decided to make violet. It really is a pretty color and the psychology behind the color is rather interesting.
I might be a bit biased though, I used to love reds. Violet is a bit more on the blue side but became my favorite color and is a lot more relaxed in comparison..
Anyways, hopefully you will figure out how to mix the colors properly. But, you shouldn't hold out on a perfect blend, the best combinations don't have an exact science and come from trial and error. Their sketch book probably had some pretty ugly blotches in it. I know mine does when it comes to paint swatches.
I think people often look for an easier way to get to the same thing, but you're right in acknowledging the journey in the process while getting to the final piece. I think a lot of artists need to step back and stop over analyzing their work or they fall into an issue of overworking projects, such as in painting, muddying colors by accident because they just keep trying to fix something that is good enough as it is.
It really is hard when timing is off. It sounds like you wanted to learn a lot more about this person. At least you know where the shop is.
I think stumbling through a persons sketch book if it wasn't out in the open to be reviewed would be wrong. It sounds like this one was open for feedback though. It is interesting to see how people change and view themselves over the years and why this is important to them. I have something similar that I look at when I am feeling down or confused, it is like a home away from home to me. It is almost a reminder to the things I wanted to change, what wasn't changed, what had changed. Some of the entries are very short, some had been erased, and some I wish I could erase but think they are better reminders even if they bother me. Most of the entries are quotes for when I am depressed. Maybe the artist left them out because like you said, they are lonely, and are hoping someone will catch that or maybe they just didn't think anyone cared enough to look.
If you really are curious about something you should inquire. However, you shouldn't dwell on it for to long or it can run imaginations wild...I don't know though, if their new note worried you, maybe you should ask, especially if you have concerns that something else might be wrong. By adding your presence into someone's life though....I don't think you taint their life, you can't color theory yourself in there lol, you might shake up how they go about mixing is all I think though, with a lot of people right now, especially because of how covid impacted a lot of us, are feeling lonely. Connecting with others helps this a lot, caring for others, reaching out to people....are all very important ways to deal with loneliness. Maybe reaching out and being friends with them is a good idea.
Anyways, it sounds like you do need more blue though. Maybe you will see the shop owner again, or, maybe someone else will be working.Hard to say how this would impact your views on the shop. At least you can always go back and try catching up with them again.
I'd be curious if you were colorblind. Sounds more like difficulties seeing shade variations though.
It's nice having such a large community of people to talk to on here though no?
So don't get to lonely yourself.