Hand-drawn illustration of five cute cartoon bacteria in green, purple, blue, pink, and yellow, with expressive faces, on a notebook page background.

A sketchy, hand-drawn illustration of five cute cartoon anaerobic bacteria, each with a unique and distinct shape — one spiral, one rod, one oval with flagella, one blob-like, and one irregular spiky form. The design should feel like a scientist’s doodle in a sketchbook, with visible pencil or ink lines, and soft color shading in vibrant but natural tones (greens, purples, blues, pinks, yellows). Each bacterium should have a funny or expressive face and little biological details (flagella, cilia, or bubbles). The composition is freeform, not inside a circle, giving it a lively, organic, artistic look. The background should be light or paper-textured, like a notebook page. The overall style: playful, scientific, creative, and perfect for a microbiology or science-themed YouTube channel. See more