Illustrations of animals in a formal / normal / street'ish and not childish way

Im aiming to provide a bit more on style and feel for this, but briefly the scope of this project involves the following: - Illustration for a panda - Illustration for a parrot - Illustration for a penguin - Should be suitable to work on print of t-shirt, sweatshirt etc - 3-4 color usage max Style and expression on the illustration should not be childish. Im looking for something inbetween a formal / normal and upwards street'ish feeling on the illustrations. The base for all 3 illustration would be that all 3 of them would have the somewhat same facial expressions. Illustrations would not require to be of the whole body, but focus will be mostly on the face. My aim is something along the road of the brand called "lacoste" but with a little twist. [login to view URL] Approach for this will probably to do one illustration and see how that goes before proceeding with the rest. I will proably be looking for a fixed price on the first illustration and the remaining two as one. Former work examples is a must