Regarding warbird finished, they've definitely gone through phases from "pretty" to "authentic". Back in the late 90's and early 2000's a Warbird Grand Champion at Oshkosh would require a mirror finish polish on a bare aluminum airplane (Google Daddy's Girl Mustang). But more and more, restorers are going for a more authentic look. Sierra Sue was recently completed by Aircorps Aviation, and it is a marvelous example of the drive for authenticity in these more modern restorations. When you walk up to that airplane, you see bare aluminum (not polished!) with the material stamping still on the metal, and the spot weld locations having corrosion resistant coating brushed over the welds.
Similarly, when you look at Cavanaugh Museum's C-47, the colors are pretty reasonable; but it has a gloss finish to the paint, which wasn't authentic for the time. I was involved in a C-47 in California that we repainted about 3 years ago, and we spent a lot of time trying to chase authenticity. The matte paint and half invasion stripes are accurate, but one thing that you often see is invasion stripes on "D-Day recreation" aircraft that are painted with perfectly geometric stripes. When prepping for D-Day, they were often put on with mops, brushes, or brooms. We decided to forego that detail, because our aircraft was delivered in August, which would have given them time to paint on decent stripes. I can add a picture of this, because they're my own pictures. One thing to note is that the matte finish is authentic, but also much more difficult to maintain.