A tangka of Acala. In the middle, Acala holds a sword and kneels on one knee. Around the middle are depictions of Acala in various stances. Why does the artist repeat the images in the background in the picture above?

a dark purple with a little bright violet red

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !