Great piece, that billboard is excellent!
Just an observation in an attempt to be helpful, but perhaps the up and over doors would benefit from a splash of colour (probably the same red of the trim) to visually break up the self coloured frontage? You could paint the whole door, just the framework, or just the rectangular pieces.
I've just restarted Fallout 3 having got nowhere with it years ago so I'm now enjoying your thread.
Edit: changed 'not' to 'now' so that bottom sentence makes sense! Sorry