Flowers of Veronica chamaedrys, the germander speedwell. The diameter of one flower is about 12 mm.(Nature park Taunus, Hesse, Germany. Natural sunlight, black cardboard as background.)
<a href="//commons.wikimedia.org/wiki/User:Johannes_Robalotoff" title="User:Johannes Robalotoff">Johannes Robalotoff</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>