I have a red/green landfall deck that I run strictly for fun not competitive (but would) love to make it competitive someday. I think your deck has some great ideas, but is generally to slow to develop for how I understand the modern tournament game. I would suggest looking at the following cards some are easier than others to obtain.
Skyline Cascade
Azusa Lost But Seeking
Eternity Vessel
Courser of Kruphix
Crucible of The World
Scapeshift
Ramunap Excavator
Sylvan Awakening
Mortuary Mire
I really like Sylvan scrying as it doesn't limit you to basic lands and can make your deck become a swiss army knife for lands. Opponent has a creature get skyline cascade, various deserts etc...
Again I don't think anything here will make the deck top tier competitive, but looking at some scapeshift decks might give you some other ideas. It may be possible to build something that can take your local tournament depending on how competitive those tournaments are. Adding to Breathe1234's comments I would say the hard thing in a landfall deck is to achieve consistency and speed both needed to make a deck competitive.
I just realized the cards aren't hyper linked, so I need to figure that out before I post again, sorry.
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