If you have a moist, semi-shady area you could try planting a thicket for the birds using plants like Viburnum trilobum, other viburnum, elderberries, native plum thicket, etc. Lindera benzion, spicebush, grows very well in shady moist areas and birds love the berries (and it provides habitat for spicebush swallowtail caterpillars). Plant a Clematis virginiana (virgin's bower) over it and voila! Instant cover and food sources.

I would add Lonicera sempervirens for the hummers if you can (native honeysuckle). Some of your hummer plants are not native, such as the chives, scabiosa, parsley...hummers also enjoy columbine, penstemon, and garden phlox.

Seed-eating birds also love the seeds of coreopsis, native sunflowers, rudbeckia and echinacea.

Your Bradford pear is unfortunately an invasive species in Virginia and you may want to consider replacing it with a native alternative if you can.

Sounds like you're off to a wonderful start with what you have. Adding a water source to your yard will really bring the birds flocking!