If you feel the signs are too bright on your model a little brush of Citadel Transparent Black Shader (they call it Nuln Oil) will tone them down and age them.
Example:
The second story sign represents signage that has been up for a time and has weathered and darkened. I went over that one and the Hotel sign with a light coat of Citadel transparent black (Nuln Oil) to age it.
The Circus sign represents a fresh sign as these were posted a few weeks in advance by the “Advance Man” and were cheaply printed and only intended to last a few weeks.
Small confession: The upper sign is printed on photo grade computer paper and represents a tin sign. The lower sign I really should have printed on cheap typing paper as this should represent a cheaply printed paper sign applied with wall paper paste, that would have the texture of the brick wall showing through.
Here below is another example of a Circus sign but this time printed on the cheap typing paper, soaked in Future Floor Wax and then applied to the fence having some of the fence texture then showing thru.
After the Future dries I spray the whole thing with matte clear to kill any shine that remains.
And of course my big Coke sign, again printed on cheap typing paper and applied using Future Floor Wax.