Big Look can suit artists of all levels. However, you will get most value from Big Look if you already have some experience with drawing or painting.
If you are looking to take your existing skills and improve upon them or explore new ways to work, or If you are looking to build on what you know by learning the 'fundamentals' of painting and drawing in a systematic way then Big Look can offer that foundation.
On the other hand, If you are just starting out and are exploring drawing and painting as a potential hobby, you might want to take a couple of basic classes or courses to get a feel for whether you want to develop as an artist.