So I don't have a pic of a drywall in an unfinished house, but the walls of my house are made of it. Gypsum wall board is the step after wall sheathing. It covers the wall sheathing that covers the wall stud. Gypsum wall board adds another layer of wall in residential rooms. After the gypsum wall board is added the wall can be painted over or covered in wall paper to complete the room's walls.
Flooring
Flooring is the floor of a room. The flooring can be made up several different materials. It could have carpet, hardwood, tile, etc. The flooring covers the original wood flooring as the final layer of floor.
Finish Carpentry(Baseboards)
The finish carpentry is an addition to the flooring that connects is to the walls. It can be in the form of several components such as baseboards, chair railing, crown molding, and many others. It serves to prevent 90 degree angles where the walls and floors meet and can be a buffer.