New yellow bird in my yard

When I first stepped outside Friday morning and saw these birds flitting everywhere I thought they were Goldfinch. The first one I got a shot at was in one of my Crepe Myrtles.

Then down to the wall, where it did NOT find any seeds, because I had not put any out.

But then on my front porch steps. This one sat there long enough for me to get 4 decent photographs before it took off.

So, what do you think it is?