This is one of my favorite stages of a project, when a design originally conceived and expressed via drawings starts to become visible in reality. The "Before" photo on the bottom was taken at roughly the same angle as the "After" photo above it. That's the same fireplace to the far right in the "Before" photo as the fireplace in the "After" photo, though we've added another gas fireplace behind the original wood-burning fireplace in the "After" photo.
The footprint of this space hasn't changed, but we've removed the low, flat ceiling, replacing it instead with rod ties in a cathedral ceiling, which adds volume and a sense of spaciousness. In my book The New Small House, I call this design strategy: Pay attention to the third dimension.