Nice play with apertures and DOF (depth of field), pleasing play with light and shadows in the last, though your choice of subjects is admittedly random and also quite a bit cliché ... fences and chain links have become such classic (to put it more nicely) motifs to test out what one can do with DOF...
The lock is too contrasted, with large parts being all blown out.
I tend to quite like the texture in the third photo, though all in all the pic is too small in its presentation to really judge that aspect. But from what I see here, tonal range looks most pleasing in 3.