You are off to a good start, you got nice and low on the Robin and his head is nicely turned toward you. I try to avoid rear end shots, 3/4 front is my favorite. It looks like a cloudy day, so no shadows and nicely exposed. I try to shoot as wide open as possible to throw the background out of focus. On the sparrow, although he appears to be singing (good), his eye is obscured by branches and he has lots of shadows (not so good). When shooting against the sky you need to exposure compensate by 1/3 or 2/3. I am with you about birds way up in trees. My favorite spot has NO TALL TREES! Here are a few properties near Buffalo that might work for you:
....Buffalo Audubon Society Nature Preserves
The South Shore Audubon Society Preserves.
....Tifft Nature Preserve -
Less than three miles from downtown Buffalo,
Tifft Nature Preserve is a 264-acre refuge dedicated to environmental education and conservation. Its 75-acre cattail marsh abounds with wildlife. Migrating birds use the marsh and adjoining woods as a rest site. Animals like beaver and fox make their homes in its fields, thickets, streams and ponds.
Good luck and keep trying.