Basically, count how much Gold that is to Build.
Now, my Braum gets about 10.5K Gold a Game.
My Leona is about 12.75K Gold.
My Thresh is about 13.5K Gold.
Apparently, or so I'm told, I get way more Gold than 'most supports', a really good Support for his Elo that brought this up gets about 9K to 9.75K Gold per Game.
So while in theory the Build is okay, and in SOME instances would even be down right OP... you can't afford it, especially since you skipped the Gold Item in the beginning.
Now, things like ONE Item can be done. Try The Black Cleaver on Leona. Still gives HP, gives 20% CDR so you can have your Abilities up to Chain CC more often, and 50 Attack Damage on a diving tank engage who uses a lot of Basic Attacks in a Team Fight adds up.
But THEN add the Passive... you are dropping Armor, so your Team can melt a Front Line faster. YOU do more damage with each hit as more of your AD gets through, and your AD Assassins, AD Bruisers/Fighters, and especially your ADC get a buff in Damage with each hit you lay.
Helps you, helps the team. Are other Items BETTER on Leona? Yes. Absolutely. But if you are going to go 'off-script', The Black Cleaver is a solid choice, and it's only ONE Item at 3,100 Gold. So if you are crushing it, you'll be able to add that 1 Item with your Boots, Sight Stone and other 2 to 3 Support Items fairly easily.
Another one that works for Supports is Wit's End. For example, I give you Braum. The faster he attacks, the faster he Stacks, the faster things getting Stunned. I'm not saying Build Attack Speed, I'm saying Build Support Tank, but ADD a Wit's End. He gets More Tank vs. AP Mages and Assassins with every hit, and he makes everyone he hits Weaker to your AP Mage or Assassin.
So you get More Stacks for More Stuns, and you get More MR for yourself and you GIVE your AP guys easier targets to delete because they are (1) Stunned and (2) losing MR every hit so they take more from your guys.
Again, way better items than Wit's End for Braum... but it's affordable and can fit in WITH a Support Build.
But notice the key.... you STILL need the Main Support Build.
Also, your 'Support' doesn't have a Sight Stone... so I call that Build 'Invalid' already.