Nice portrait, isn't it? I found this Elephant Hawk Moth (Deilephila elpenor) caterpillar by Keravanjoki river when I was pulling up Himalayan Balsam plants. It is trying to frighten me by pulling in its nose so that spots look like big eyes and its front feet like teeth. The caterpillar was about 8 cm long and that surely is enough to frighten many.
We have a similar caterpillar; it's called a spicebush and turns into a Tiger Swallowtail. Nice capture.... those eyes supposedly keep him safe from birds. :-)
Love the green. :)