I'm guessing these are baby bunnies? They're harder to ***.
First of all, as a disclaimer, I am not a breeder and my experience with sexing is limited. Others may disagree with my opinion here.
From what my old eyes can tell, the first pic looks female. #2 looks female to me (teardrop shape) but the light isn't the best. #3 has the classic female teardrop shape. #4 is a bit blurry, hard to tell. I see the teardrop, but there's what looks like a bit of protrusion as well. If I could see from the side I'd have a better idea. On a male, the ***** looks like a little tube with a circular tip that protrudes noticeably. Girls always have a teardrop shape with a slit instead of a round, circular opening, and it's a lot flatter. They look very similar to a female cat.
Usually when I *** them, I roll my fingers around a bit as I'm pressing on the vent, to get a better view of how far the genitals protrude, and I view them from a few angles. I wear a head lamp so that the light is better. You'll notice in the sample pics on the website I posted, they show the males from the side so you can see how far the ***** protrudes. Try looking again, paying close attention to how far the genitals protrude and the shape of the opening at the tip. Those are the two things that show it's male: protrusion (like a little tube) and a circular opening - not a slit or a teardrop.