To start to answer your question I first will ask you a bunch of questions.
When you painted 15 years ago did you use testors brand model paints?
Did you paint your minis in nothing but colors strait out of the bottles?
Have you ever dry brushed paint onto a mini to highlight the raised parts?
Have you ever thinned down your paint to color in the indented parts?
Did you prime your minis? If yes did you use white, gray or black?
I ask because 20 years ago I would have answered Y Y N N N and I would be happy to give advice now. But if 15 years ago you were already Y Y Y Y Y then I will start asking you for advice.