You actually could write about more about your build. Remember that most guides are for people who are new to that champ or even new to LoL. Write something about why you build items, how people should use their abilities, how to gank, how to behave in a team fight. So far there is a lot missing.
Additionally I'm not really sure if Leona is a viable jungler. In comparison to Jarvan (who is pretty similar to her) she should be slower.
How can you jungle without any health pots? I'm sure you usually take one but new players will most likely fail with that.

Keep improving that and I will vote.

I have never thought of Leona jungling but it seems a good idea