Hate to say it but 8 million zip ties for me. This is original fast grass for the bottom layer and lots of other mixed real and fake vegetation added every year. I have so many layers on my boat it is crazy, but adds to the camo effect. I am lucky my boat lives in the garage so the camo does not get beat up by the weather, only driving down the road.
Early season we add cedar branches to add some green (early sept goose) they hold up great and the birds don't give them a second look.
For the picture you posted, I would ditch the boat and be on shore with a natural blind/A frame or layouts, use the shadows of the bank to your advantage, the boat sticks out way too much.
ETA boat is a 1760 with a hard side blind