In Love with Pink
A very small flower; about 10mm in diameter. Shot with natural light in an overcast day. From my internet search, I think this is the flower of a type of cacti plant called EUPHORBIA MILII VAR. SPLENDENS, common name is "Crown of Thorns". There are many varieties or hybrids of this plant.
Follow the link to another Flickr member's photostream, there are many photos of this flowers --->