added a new sign

It's been a while so here's another sign. I've also improved the look of another one

Hi! I've added a new sign and tweaked almost all of them. I've updated the screenshot so you can check them out

Added a new signs and tweaked the contrast of another one.
The missing ones are slightly more difficult (they have rust, paint, dirt and other things) so it may take a little while before i make them because i have to learn some stuff before.

another update: improved the look of a sign and added a new one

Increased the resolution of one sign. Sligtly tweaked the contrast of another one.