I like this one
the most. Nice series!
Good use of OOF throughout, although on some images there are white areas or blotches that distract in the background. I wonder, is this the original OOF or has it been altered by sharpening? It looks a bit unnatural to me.
I feel that the attractive of these images lies most in the texture and color contrasts of the angel images and the fllowers, collars, etc. hanged around. I mean, strong colors, soft texture vs. grey stone. The OOF is important to isolate the subject and give a 3D feel.
Maybe a closeup of those collars or flowers, including a recognizeable feature of the angels such as a hand or wing, could be a hit. I believe you could try that with just a normal lens and an extension tube or a diopter.