The repetition of these floral patterns are an excellent example of small scale arabesque. You can see in the drawing the artist as already started on the outer perimeter dividing the ring into even branches to continue the pattern on.
Mosaic Mosque of Colors by Ramin Rahmani Nejad on . // Nasir-ol-Molk mosque in Shiraz - IRAN. It is the most beautiful place in world I ever seen. It is full of Colors and Lights everywhere inside main Hall.