People tend to not have a good eye for subtle details. I do. I'm as obsessed with details as Batman is.
If something isn't "aware" then it's "subconscious".
It's more complicated when it's a picture of a dog. How is it look and where? What direction? All of these help clue me in about someones "real" personality. Does it have a slight head tilt with a curious look? Then odds are the real person is the inquisitive type. Maybe more playful.
Demonic profile pic? Then you're probably less afraid of darker things. Soft delicate looking picture? Then you might have trust issues because you're weak and get afraid more easily.
I've been online every day for a decade. One picks up on things. I also talk to the people with the pictures and I'm proven correct.
A name can also tell you a lot. If someone is called Shar for example then that's the goddess of loss from D&D. As I suspected that person had anxiety. I worked the topic in. Shar is the goddess of loss in D&D so it was pretty clear to me why they'd gravitate towards the name. People gravitate towards what they relate too.
The most subtle of details. A picture. A name. The smallest clue can clue people in. If you know what to look for.
I'm more suspect of a single letter without a picture. Had one of those try to exchange discord names on first message. Makes me suspect. "Blank" profile pictures make me cautious. I'm a risk taker but why would someone want to exchange discord names right away when messages work? Blank profile picture can also indicate lack of imagination.
Dick pics show no shame. And maybe desperation for fun instead of what's on the mind. That's going to depend.
I've been learning observation for a decade. So I'm like hyper sensative to even the most subtle of details. The skill comes in reallllly handy when someone plays with their zipper inside their coat. I noticed the gun in that case. I defuse tense situations. A keen eye comes from learning to handle difficult people. It wasn't my goal to learn observation. It's more something that happened when I stopped "Looking" so hard.