A lot of people were asking about my runes/masteries for jungle Leona, so here you are.
Attack Speed Marks - without them you almost die before clearing 3 camps.
Flat Armor Seals - better for early clears, less damage from camps
MR/lv Glyphs - late game etc etc
0/21/9 masteries, picking up Tenacious in defense tree and Runic Affinity in utility.
I usually start Gromp, smite it immediately for the poison passive, then Blue Sentinel and Murkwolves last, smite should be up for Murkwolves. That will give enough gold for Trailblazer, so back there and pick it up before going to Red Brambleback. It’s especially good to get to 800 gold and immediately pick up your Mobility boots (with Tenacious mastery + Juggernaut enchant you will have enough tenacity, so you don’t need Merc Treads unless they’re really heavy AP and your team is losing their lanes.