Mom
Slanted roof. I think your ceiling is going to do this
Crown molding (BIG) can really make it look more expensive
Color , Alan’s door, golden brick and black / grey
Colors / golden tones (like current brick), light wood and gray/black
Bench and storage
Combo of colors and textures
A real storage shed for dad and it would make the backyard more intimate
Mix of rock, dark wood, light wood, conrete
Three colors
If the ceiling gets to low in the shower area.... this might be a solution
Q