Depth and perspective in art refer to the illusion of distance and three-dimensional space created on a two-dimensional surface. It is the technique of making objects appear closer or farther away, and creating the illusion of depth and space in your composition.

Creating depth and perspective in art makes your composition more interesting and engaging. It allows the viewer to feel as though they are a part of the scene, and adds a sense of realism to your art. Without depth and perspective, your art may appear flat and uninteresting.

There are several techniques you can use to create depth and perspective in your art, including:

• Overlapping: where objects in the foreground overlap objects in the background
• Size: where objects in the foreground are larger than objects in the background
• Linear perspective: where objects appear smaller as they recede into the background
• Atmospheric perspective: where objects appear less distinct and bluer as they recede into the background

One way to practice creating depth and perspective in your art is to draw or paint a landscape. Use techniques such as overlapping, size, linear perspective, and atmospheric perspective to create a sense of depth and space in your composition. You can also practice with still life setups or portraits to create the illusion of depth and three-dimensional space.

One common mistake to avoid is making objects in the background the same size as objects in the foreground. This can make your composition appear flat and uninteresting. Make sure to use techniques such as size and linear perspective to create the illusion of distance and three-dimensional space. Another mistake is not considering atmospheric perspective, which can make your composition appear unrealistic. Finally, make sure to balance your composition by not putting all the objects in the foreground or the background.