[alt text: an illustration depicting a triceratops, a tyrannosaurus rex, and a human boy. The triceratops is dressed in shorts and a sweater vest, wearing headphones, and giving a thumbs-up. The t-rex is dressed in a leather jacket and sunglasses, and is giving the human a high-five. Below the illustration is stylized text that says, "It's totally cool to be GAY AS SHIT".]
[Image description: a screen cap of the Yeti Cool Brothers with one saying "He must be queer. Pretty cool"]
FYI, you can just put the image description in the square brackets after the exclamation mark when posting an image, it should work as alt text.