All reference pictures for these illustrations were taken by me or my brother.
Above I used Prismacolor pencils on colored paper, it measures approx. 12 x 17 inches.
Below is Randy the Zebra, this was done in Kohi-Noor technical drafting pens and black ink on Illustration board. It measures 14 x 19 inches
Below is Morty the turtle, he was also done with Prismacolor pencils and colored paper, some PhotoShop was used for the lighting effect. This one measures 18 x 22 inches