I second/third/whatever the suggestion of a therapist.
Something from my own experience may be of use, or not. So, I was raised in complete isolation (homeschooled), Mom worked and did a lot of OT, and she had no idea my father was forcefully raising me to be the son he wanted. Punished for any interest in anything female, punished for "moving" in a feminine fashion, etc, to the point that my body language, vocal tones, word choice, body movements, etc, are still highly masculine at 31. I don't have the spoons with my disability to try to relearn this, and it means despite the fact that I dress very femme, I'll still get misgendered. My girlfriend has mentioned she has to regularly remind herself I identify as female because the body language and such read male to her. So... that's my background.
Growing up, Mom introduced me to science fiction and fantasy books. I read, a LOT, because it was a way to escape what I was going through. Now, even though I'm queer and almost exclusively attracted to female-identifying/feminine-leaning people, I noticed that when I read books with awesome female characters... I didn't want to be involved with them. I wanted to BE them. Despite no interest in real life men, I'd find myself attracted to some of the male characters (I think it's probably that the things I'm attracted to in fictional men are rare in RL men), but the women? Nope, never attracted. It was always that I read about them and the awesome things they did and how strong they were and I wanted to BE them.
That's a little different than looking at pictures, but it's kinda similar. I think that it's true for both, though. Whether you're reading books with strong female protagonists or looking at pictures of women you admire... if your reaction isn't attraction but what you feel deep down is that you want to BE them, or be LIKE them... that's not attraction. That says more about who you ARE and who you want to BE.
I suggest a therapist versed in gender because they can help you better to figure things out and put them into words.
*hugs and cookies offered*