I'm afraid that you have the terms "jealousy" and "envy" somewhat mixed up.

Jealousy is the term used to describe the emotion you would have if you felt that something you had was going to be taken away from you, such as would be the case if you feared losing a boyfriend or girlfriend to someone else.

Envy on the other hand, is the term used to describe the emotion of wishing you had what someone else has, or the feeling that you have when you think that what you have is not quite as good as someone else's, be it a physical item or a skill.

What you are experiencing with regards to your artwork, is "envy" not "jealousy".