Thank you, it's great to hear the machine details work for you, I spent quite some time looking at engine explanations and historical machine photos so I'm happy that effort paid off. (Yay for children's lexicons on the history of technology, that was the book I found with the best close-up photos of many old engines and mechanical part rather than just showing tiny pictures of complete old machines where you couldn't make out the details, and it explained how everything worked too! *g*)

I'm still fairly new to acrylics, as this is only the fifth piece I used them to color (I started because my pet rats destroyed my tablet cable...) but I found them much easier than water colors, which I can never make work right. I mean, I use the acrylic paint mostly in thin glazes so that they give kind of a water color effect and only to color inked lineart so far rather than true painting, but I tend to think of the acrylic paint as "water color for dummies" because they won't dissolve again and you can just paint layers over each other until you have a color and shades you like, plus you have a white for highlights.