Four sketches of birds and one design for a grotesque mask, mounted together

The image features a collection of five sketches mounted together on a single sheet of aged paper. The top row contains three sketches: - A small bird with a pink breast and black and white wings, facing left, with its beak open. - A rectangular design for a grotesque mask with a beard and mustache. - A tall bird with a rounded body, facing right, and a long neck. The bottom row contains two sketches: - A bird with its head down, facing left, with black and white wings and a pink breast. - Two birds with their heads turned to face each other, both with pink breasts and black and white wings. The background of the image is a yellowed paper with darker spots and stains scattered throughout.