I really must make an effort to get to know the names of the plants in my garden. These are tiny yellow pom-pom flowers which really brighten the garden up - possibly called Brass Buttons but again I'm not convinced.
It could be a Cotula coronopifolia or brass button they are 10 to 50 cm’s high. From your photo I cannot tell how high they are.
Great shot by the way!
Great shot by the way!