Try pulling the stem out of the steerer tube, and make sure you save that third pic so you can reference how all the top headset bits are ordered. (I'd flip the bike back over, fork ends in the carpet. Brace the forkends between your feet and twist the handlebars back and forth until the stem comes free, might even be easier if you put the front wheel back on)

The fork could be snagging on that reflector mount or a keyed washer, or...

You'll also have to retrieve the stem wedge from the steerer tube.

Next time, try only loosening the stem bolt a few full turns, then rapping on it with a hammer, then pulling out the stem, THEN proceeding to remove headseat nuts, washers, spacers, etc.