Felt-Tip Doodle with Blue Accent

Create a charming hand-drawn cartoon illustration that feels like a quick sketch from a black felt-tip pen on paper. Keep the linework natural and expressive, with gently uneven strokes, soft wobbling outlines, tiny gaps in the contours, and the subtle imperfections of a human-drawn doodle. The overall look should be simple, airy, flat, and understated, with a warm editorial sketchbook mood rather than a polished digital finish. Use only sky blue as the single accent color, leaving the rest in clean black linework and plenty of open negative space.