Hi Amarillo! I'm not much of a cartographer myself, but I can offer you a few pointers.

The first thing I notice is the flagstones - they are huge. Compare the size of one of the flagstones to the width of the door; the average door is about 2.5' - 3' wide, a bit bigger than the width of a person. By that measure, some of those flagstones are up to 6' in length, which makes the building look a lot smaller than it actually is. You can fix this by shrinking and duplicating the texture you used for the stones, to make them smaller in comparison to the door.

Another thing I'd recommend, just to unify the final image, is to make a layer in Photoshop above everything else, fill it with one colour, and lower the opacity to 5 - 10%. It can be any colour you like, but it'll bring all the colours together and make them look like they're in the same scene, rather than a bunch of separate elements.