Pic #1 the bark at base of tree was signature Tilia, though your warning that we may never get it right was alarming and threw me off. Then when I opened pic #2, those are classic Tilia sucker growth. I felt pretty confident, I deal with these trees too often! Grover had a post a while back of a tilia from pretty far away. I got that from the root/trunk suckers that engulf these species......how do these specimens do with the trunk suckers?
Nice work BTW, is that your art?