The wall painting is subject only to masters, professionals in their field. If you do not have artistic talent, then the work on creating an image on the wall is best entrusted to a specialist. However, here you need to be very careful. If the artist takes a small amount of money for his work, then it is not a fact that the quality of the image received will be at a high level. As a rule, good artists are able to adequately evaluate their work. In addition, you should not hire a novice artist. You do not know what such a situation can lead to. It is best to use the services of an artist who can provide examples of his work.
The artist needs to try so that the image does not work out too boring. But his responsibility does not include preparing the surface of the wall, on which he will create in the future. Of course, minor defects in the wall are unlikely to be noticeable, because the drawing will cover them.
However, irregularities on the wall will be striking, even if the wall painting is carried out by the most experienced artist. In any case, the surface of the wall should be as flat as possible.
Do not forget that wall painting is performed at the end of all repair work. Perhaps the painting will look too bright against the background of an empty apartment, but after filling it with furniture, the image will acquire an extraordinary look.