This sketchbook is full of Transformers art by Marcelo Matere, a Brazilian artist who works for Hasbro as a character designer, concept artist, packaging artist, and illustrator, for toys and videogames for "Transformers", "G.I. JOE", Marvel, and other brands. He also draws children's books and comic books (Transformers IDW).
Signed by the artist with a Transformer head sketch!