User blog comment:Ieatrice/New Image Galleries Available in Labs/@comment-24082086-20141020092052/@comment-1038387-20141020100322

You can't change the size - the gallery is the same width, images change width to match.

As explained above, using |link=, it overrides the new galleries.

The colors are grey on slightly lighter, semi-translucent grey. I don't think you can change the color. It's not helpful that bluelink and redlink are the same color.