The bee on the Crowea is a resin bee (Megachile sp.). Bees in the subgenus Megachile (Eutricharaea) are leaf-cutters not resin bees. The bee in the fourth picture seems to have a green thorax and looks like Lipotriches phanerura, which also has orange at the end of the abdomen. The final picture shows Lipotriches ferricauda which is a bit larger than L. phanerura.