I'd recommend looking at anime and manga art. Many artists post their detailed eye drawings there, which can be really helpful. Also, art textbooks specifically for beginners often have good reference sections on cartoon eyes.
One great reference for beginners is online tutorials on platforms like YouTube. They often break down the basics step by step.
You could start with basic anatomy books and online tutorials. Sites like DeviantArt also have lots of helpful references posted by other artists.
Art books focused on cartooning often have great eye drawing references. Libraries or online bookstores are good places to start. Also, some YouTube channels dedicated to art tutorials might provide links or show examples of useful references in their videos.
Another option is to browse through animation studios' official websites. They might have concept art or reference sheets available for public viewing. For example, Disney and Pixar sometimes release such materials.
You can look at classic cartoons like Mickey Mouse or Bugs Bunny for eye styles. Their eyes are often simple but very expressive.
You can look for references on popular art websites like DeviantArt or Pinterest. They have a wide variety of styles and poses for cartoon cats.
You can look at popular cartoon shows or comics for inspiration. For example, Disney cartoons often have beautifully drawn faces.
You can search on specialized art websites or forums. Many artists share their references there.
You can start with simple character poses and expressions. Look for tutorials on basic body proportions and common emotions.
You could check out anime and manga series. They often feature unique and interesting male hairstyles that can serve as good inspiration. Another option is to search for stock image websites that have categorized cartoon hairstyle images for easy reference.