It doesn't appear to have grown much but I did finish the 2nd full heart. I had to rip 4 rows because I skipped a bar and didn't find it till I was reproducing the heart pattern and in filet (especially the open mesh background), a missed bar is a blunt error and not easy to hide.
The panel is now about 8" long and, as you see, I have nearly used up the entire ball of thread.
I use a loop of yarn to help keep my thread (and yarn if I'm working with it) in position over my index finger. I tend to have a problem with it sliding off and prefer it to stay put between my knuckles.