To the person who requested artwork from Nico Marlet they could buy:
A limited edition print from the How to Train your Dragon 2 Show at Gallery Nucleus is currently on sale, as well as many other artists’ prints for the movie.
[Link to the Store]
And likewise, his original sketch book is still available for sale.
Nico Marlet - Thunder Drum design, from Book of Dragons
Hiccup and Viking designs - Nicolas Marlet
Nicolas Marlet’s Designs for the Night Fury in How to Train Your Dragon
Stoick the Vast Expression Sheet by Nicolas Marlet
Viking concepts and sketches - Nicolas Marlet