I like to create my own graphics and I used to spend hours drawing them on my iPad from scratch. Then I found Adobe Illustrator Draw,
a free app. Gradually I discovered loads of shortcuts that cut down my time in creating. You can upload a photo and draw over the top of it and then bucket fill it. Hide the photo and you have a great looking original graphic. Students love this and those who say they can't draw have a real sense of achievement when they finish their graphic. Now they can make their own cartoons and use their own drawings. They look great in Google Slides and Book Creator. It is a good idea to use a stylus as it gives you more control over your drawing. Here are some examples of mine.