There are immensely more colours than there are words in the whole of the English language. There are immensely more shapes than words can name. Likewise textures, and patterns.
And there are immensely more depths and blends of feelings than words can name.
For a great many people, the most important aspect of a picture is the feelings that it evokes. What can be said about a picture's appearance, and what can be said about the feelings that it evokes is limited.