There are plenty of DIY shed tutorials online, but what's often lacking is how to properly construct the foundation to ensure it's square, level, and less prone to rot. This videos shows you how to accomplish all three. (How To Build A Shed Diy)
Although more park model size, this living room has good window placement, allowing furniture that doesn& back right up to glass, gives some level of privacy, and yet admits plenty of light. This could be applied to a smaller tiny home too.
As seen on season 1 of Tiny Luxury, this spacious, spa-like bathroom features a galvanized horse trough soaking tub, vessel sink and lots of natural light. (Maybe not the big window right next to the tub though)