Pixel art, UI icons, colorful, detailed, tiny characters, 16x16 pixels, cute expressions, various professions, doctor, engineer, chef, musician, astronaut, superhero, fantasy creatures, mythical beasts, dragons, unicorns, mermaids, robots, futuristic, sci-fi, minimalistic, outline style, solid colors, bold lines, geometric shapes, icon set, button design, digital interface, mobile app, website, video game, retro aesthetic, 8-bit graphics, pixel perfect.