In the image below, is an example of how creating depth in a picture can be done, even when looking up into the sky, the buildings create an illusion of depth through their linear structure of lines, converging to a point in the sky, drawing the eye up into the sky, like the perspective construction lines in a drawing, taking your eyes, leading them off into an imaginary distance. This combined with a close fore ground subject, helps the illusion become more believable, in this image there are really only four subjects creating the illusion, the face and building above it, the dragon and the building behind it, all creating a depth of field in the onlookers eye, which tends to be lead from the top middle to the bottom right hand corner and vice versa.
In the image below, although the eye is lead up into the sky by the lamp post and the cranes to observe the big cloud filling most of the picture, the eye is the lead off as other clouds diminishing in size, lead off into the distance, creating the illusion of depth once again in this image, these are two examples of how perspectives, can be created even when looking into something as seemingly empty of structure, like the sky. It is interesting how other structures in the image can help to create the illusion of depth and even something as simple as clouds, can all help when they are reduced in size.
Distance and depth are created by using lines to lead the eye, the reduction of objects in size and making the objects seem further away, less well defined in detail, giving a further impression of distance in your pictures. Although these are not drawings as such, I used them because they give us some very good natural examples, of how distance and depth are created in the world around us, and how this can be utilized to create these illusions in our own drawings, if we think about them, for incorporating them into the drawings we do.
(”Miki Falls”) manga creator Mark Crilley shows us in one of his how to draw videos, Manga backgrounds, an interesting demonstration on, how you can be creating depth in your pictures and how it is achieved by placing an emphasis, on using color and line work to create the illusion of depth, controlling the definition of objects within your picture, making fore ground objects more defined than background objects.
Take a look it will be worth it.