If you were negative until 39 days after the first man, he is not the dad. You don't have a real problem, just a mental issue.
The only way comparing your child's pictures to anything would help, is if you compared your child's pictures to the baby picture of the man at the same age. That can be very revealing, when the child is under age 2 and the photo of the adult is also when he was under age 2. But comparing an adult's face to a baby's photo tells you nothing. (My son and my husband's baby pictures are so alike that they could be twins. But for how much my son looks like my adult husband, he could have come from the milkman.)
Here is the thing. You say you're dealing with "anxiety," but who the dad is, is a straw-man worry to keep you from having to face something that is harder for you to cope with. I'll post what I've said often here before to people with this problem.
In the DNA/Paternity community, usually if a woman obsesses that a man is the dad who the dates show is not the dad, the problem is that she hasn't addressed her real issue, and reassurance about it will mean nothing because it is not addressing what she is really anxious about.
Every woman who does this (looking right at obvious medical evidence about paternity and not heeding it) has a different reason she assigns her stress to the question of paternity even in the face of all evidence. Often, it is guilt or shame over her behavior. Or it could be worry about adding another child to the family, or wishing the other guy was the dad and being ashamed of it, or resentment of her husband, or money issues, or feeling God will punish her, or not wanting to be a mom any more, or secretly not liking the guy who is the dad but feeling she can't leave, or it could be something else. Those worries are deep and threatening, and not easy to control, and if the concern happens to be one that makes the woman feel ashamed, she just has to live with it, since she did the act that created the concern. A person's mind in this kind of existential stress often lets the anxiety settle on something more cut-and-dried. (Like obsessing over the dates and what if the father is someone else.)
Identify the real thing that is bothering you, and talk to a counselor about that real thing. The fake fear about who is the daddy will begin to leave, as you address your real cause for being so anxious.