Here is a lesson using a photograph as the starting point for a drawing. This is an antique chair that came from my grandmother which has an Empire style. When I took the photograph, I was careful to position the chair with a two-point perspective view with the front corner as the leading edge. I also moved it to a space that provided a simple background.
In my sketch book, using very light lines, I drew a grid with the same proportion that was on the photocopy. Using this grid as a guide, I drew the contour lines of the chair. When I had the outline of the chair, I erased the grid and drew the cabinet behind the chair and the floor texture.
Using a drawing marker, I redrew the image right on top of the pencil drawing. I adjust the drawing as I went along. This provided me the opportunity to make improvements on the drawing. Using stippling and lines, I added texture was to provide value and pattern.
You can see this is a quick, unrefined sketch that still has some pencil marks on it.