No, I think you have mixed up two different things. 1) Creating music is called "composing." You paint a picture, you write a novel, you compose a symphony. 2) In painting and photography, "composition" has a specific meaning. It does NOT mean the whole act of creation. It is ONE of many characteristics that make a picture beautiful. It means specifically the spatial arrangement of the objects within the frame. If you aim a camera badly and "cut off someone's head," that's really bad composition. The positioning of the heads and the people and the body in Rembrandt's "The Anatomy Lesson" is an example of good composition. https://en.wikipedia.org/wiki/File:The_Anatomy_Lesson.jpg This painting is an example of skillful "composition" and also skillful "chiaroscuro."

You could say "He taught me the art of composition" but the word composition itself is very broad and could be attributed to anything that is created (music, writing, poetry, photography,film,painting... etc). In my personal opinion, composition is different from artistic skills, simply because anyone can compose without artistic skills. For example, I could go over to a piano and start thrashing the keys (regardless of the fact that I have no idea what I am doing... I am composing). However, to do this with artistic skill, or craft, implies that it has artistic potential or that I have a talent for it or that it is worth something. Regardless the saying in the first sentence above should serve your purposes. I hope this helps.