I'm a total amateur at map-making, and I'm afraid I haven't used CC3, so I'm probably not going to be much help. I usually use photoshop or GIMP, so I am unfamiliar with the limitations and benefits of your software.
I like the detail you have added inside the building, such as including a back storage room, and varying the size of the bedrooms. Adding realistic touches like this makes the building more real. One thing I particularly like is the ring of shadow around the exterior of the main building; it really makes the walls pop out at you. I think the other buildings could benefit from a similar effect, as they look rather flat right now.
In the south-east corner of the map, the grass texture blends into the dirt pretty smoothly. Could you use the same blending affect along the edge of the cobbled pathway through the center of town? It might look more natural than the sharp edges you currently have.
I see that the tiles on the roofs of the other buildings do not line up along the central seam. Is this the issue you were talking about? I'm guessing that this is because the shadowed half and the lighter half are two different objects you placed? I am entirely unfamiliar with the program you are using, so I can't really help much. If you are saving the image as a JPG or some other image file, you could potentially fix this problem importing the final image into something like GIMP. If you don't add the shadowed half of the roof in your original program, you could fairly easily add a rectangle of semi-transparent black over the roof in GIMP or any other image software. That's more work though, and someone may be able to help you with the program you are currently using. Just an idea!