Well actually, if you open up the aperture (smaller f-numbers) you're going to lose depth of field, not gain it. Smaller apertures would increase your DOF and allow more of your subjects to stay in focus.
Theyre rather soft, underexposed and too contrasty for my likes.
Technically theyre nice, I like the composition of them. The only problem is that you cut a little bit off the bottom of the last flower. Still looks nice though