Sketch is a pretty basic app, I’ll admit. There are a number of good filters here to change a photo into a sketch, but unlike Brushstroke, you only have two possible adjustments you can make – brightness and contrast.
Having said that, there is something to be said for an app that’s simple and intuative for younger students to use. Aside from the filters, a really good teaching point would be choosing an appropriate filter for the photo they have taken. Not all filters look good on every photo, so you need to be picky about which one complements the photo you are trying to “sketch”.
The video of how to use the app is below.
Here are some of the better examples from the Grade 2 students.
Confessions of a Media Arts Teacher 