That is an amazing project! I'm impressed. I would offer three suggestions. I would add a "V" shaped plate between the top two teeth to add a center grip and in case you pick up a tree by the trunk parallel to the tractor. I do this very frequently. I have also use it in a similar fashion to pick up a long post and transport it or to stand it up in a pre dug hole ( as in building a pole barn". But my point is, I often pick up things longitudinally, not crosswise.
I would also add a protective plate, or mesh in the rear to keep limbs from poking through to the front of your tractor.
And perhaps spacers midway between the main bottom tines to keep debris from falling out, for instance when picking up smaller stuff or rocks.
But overall, that's a piece of art! Great job.