Whimsical Brain Doodle T-Shirt Design

A whimsical t-shirt graphic in the style of a sketchbook doodle, presented as a self-contained element with a transparent background. The central graphic is a cartoon brain with a tired expression, with the numbers "6" and "7" bouncing inside it. Surrounding this are small, scribbled doodles of a broken pencil, an apple core, and a coffee cup. The text "My brain all December" is written above in an imperfect, handwritten font. The entire design is a simple two-color graphic (e.g., black and red) with no background paper texture.