If you’re looking to add some extra texture to your illustrations, there are a few things you can do. One is to use a texture effect in Illustrator. This effect can be used to add some realism to your illustrations, or make them more colorful and vibrant. Another option is to use a filter called " Texture." This filter can be used to create different textures on your illustrations, depending on what you want them to look like. Finally, if you want your illustrations to have a more professional appearance, you can use an image editor called Adobe Photoshop or Microsoft Paint.