You may be right about the paint thinner, i was using it on a brush to fix my mistakes, but the paint was still a bit soft. Give it a week to harden, and it may be a real different story.
Although its not real paint thinner, its bush cleaner made by Testors for Testors paint. Not sure if its a real big difference, i would assume its standard paint thinner with a brand label on it so they can charge you extra.
You're right about the glossy thing to, the camera flash up close makes them extra shiny. But get them on the kitchen table under the playing light and they look fine.
I just got to learn how to paint a straight line. I felt my hand shaking almost out of control every time i tried fine detail. I even switched to a tooth pick to do really fine detail like the sunglasses, while trying to steady my hand and the figure by resting them against the table.