No no, Purple in the skin is good for me. I usually make a mix with hull red or red violet with my base skintone to make glaze and shades. Maybe, there is some areas that seem strange to my mind because should be more contrasted. It is weird because there is a good gradient of skintone. It is weird too that it seems to be rough and smooth transition in skintone. Don´t know if this is something desired or not.
For example, if you see the 10th photo, the 2nd miniature. The leg is pretty well executed with shades and lights, but the torso is a little bit plain.
This is go for too much detail, I think the minis are quite well painted and I love your work. Simply, I am used to try to give a tip even thought I think that is good. One of my friends is a well-known professional miniature painter, so, he ask me for it.
I am hard trying to show my comment as a friendly and constructive one and I have the feel that I am making it worst ^.^`. English isn´t my mother language and it is a bit difficult to me.
I had a clue of how basses were made. Hopefully, I am going to get an airbrush soon and copy your idea 😄