The first one I think is by far the worst. But the secondand third are delightful. I understand your reasonnig behind the length of the first note in the third part-at least i think I do- but it might be wise to shorten it as well as some of those pauses by just a bit.
The second one has a fair melody, but I think just a little counterpoint in it would be a good thing. Overall though, good work, very inpresive