From these drawings, the book is probably the most interesting example of a drawing at an oblique angle. It is noticeable that the top-leftmost short edge(the one across the thin side of the book) is shorter than the top-rightmost, because it is further away from the drawing position. However, the leftmost vertical edge is longer than the closest vertical one. This is because the edge closer to the drawing position is at a very small angle, while the other one, being further back, is at a slightly bigger angle, revealing more of the length of the real edge. Both these may make the drawing seem wrong in terms of perspective, but according to the explanation above, it is logical that the edges look this way.
The pencil drawing shows effective use of foreshortening with the back being smaller than the front and without the proper texturing, making the pencil seem shorter.
The same goes for the drawer. The front side is obviously larger than the back one due to perspective. Again, a texture along the sides would aid in showing the depth of the drawer.
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