As a longtime fan of Assassination Classroom, I always find it exciting to revisit artwork of Koro Sensei and see how my style improves with each iteration. When I initially drew him, the colors were vibrant but somewhat flat, so for this birthday tribute, I focused on softening the palette and enhancing the shadows to give more depth and life to the character. One technique I found effective was layering semi-transparent colors to create a gentle glow effect around Koro Sensei, which really emphasizes his cheerful persona. Shadows were subtly adjusted by blending darker hues around the edges and folds, making the artwork feel more dynamic without losing the cartoonish charm that fans adore. I also experimented with light source direction to add realism to the shadows while keeping the illustration true to the anime's style. It’s fascinating how small tweaks can significantly affect the mood and perception of a piece. For fellow artists looking to enhance their fan art, I recommend revisiting older pieces and considering how color theory, light, and shadow interplay. It offers a great learning opportunity and can breathe new life into characters you love. Personally, Koro Sensei represents more than just a character; he embodies themes of growth, redemption, and humor, making him an inspiring subject to draw. Celebrating his birthday through art is a delightful way to honor the series and its impact.