There is no right or wrong in art. Both representational and non representational art can be good or bad. Good art, at least for me, is one which creates a response in the viewer which is similar to the artists own initial impression or intent in relation to the subject matter.
Even though I paint representationally, I am always using a certain degree of abstraction. Nature is three dimensional and my canvas has only two dimensions, so, by definition, I need to abstract. How much I want to stick to what I see or how far I want to simplify is up to me and they way I feel that day. Sometimes I enjoy playing around with both abstraction and figure in a painting. It is just a matter of shapes and colors put together in a harmonious way.