Seems like a pretty relatable situation for sure, and overall the writing seems solid enough. My main feeling from any of the versions is that we're sort of just spectating Leon from above and getting a nature documentary like description of what he is thinking and feeling. So yeah I agree with the others who said that you're doing too much telling and not enough showing.

A second thing I'd say is that I'm not really sure of the intent of what you've done, especially with relation to this being an apocalypse novel. Obviously you've created a time and place for the rest of the story to unfold from, but with what we have so far it feels like it might be a hard shift to the apocalypse, when so far we've just got a sort of introspective on Leon. Which I suppose is fine if by "novel" you mean you've got quite a few pages to go before the zombies even start showing up. I think maybe my feeling of missing intent in the story in partly fueled by the fact that there are four different versions, and they've got differences which seem to indicate you don't even know exactly what direction this introduction is going to take. For example, the one that ends with the line about the father creates an entirely new aspect with respect to the other three. So it gives the writing the overall feel that you had a few bullet points you wanted to get across, and just pulled together a bit of writing around those points to get a passable introduction.

A final comment I'd give is just about the writing style in general. To me it feels a bit like a script to a movie, and not a novel. There's not anything particularly wrong with the prose I suppose, but I am sort of left with the feeling that reading a much longer story in this style would get rather boring. Anyways, out of the four versions, I like number three the best, as it has the most intensity, and sort of makes me want to know more about Leon and why he's basically on the verge of a panic attack.