I think we have different ideas for what the word, "glossy", means.
When I hear the word, the first thing that comes to mind is the shiny, mirror-smooth, highly reflective paint jobs on brand new cars. This is what Hawkeye was showing in Post #2. With the exception of an occasional door or some relatively small features / adornments, I don't think I have *ever* seen the major walls of the exterior of a house reflective like a car, unpainted corrugated metal buildings notwithstanding.
In fact, even if one applied (in the real world, not PS) a glossy interior paint to (say) the tan exterior walls of this house, it would not look glossy because of the underlying surface appears to be far from being smooth, let alone ultra smooth like a car exterior. Being able to see the texture of the wall in the un-retouched photo was one of the reasons I asked you to post it.
Are you sure that's what you mean when you say, "glossy"? If so, that means we would have to simulate things like a fairly detailed reflection of the red brick wall in the brown (formerly tan) wall facing to viewer's left, just the same way you see reflections of the sky and everything else around them in photos of new cars. That's a lot of work, and, to be honest, it's requires pretty advanced PS skills.
By any chance, do you really mean bright highly saturated colors? Or, maybe, those colors on a highly textured stucco-like surface?
Tom M