Trace and Sketch:thickness app is a free drawing tool for your Android device. Using this tool, you can easily draw over any existing image or create your own sketch by following the outline of the original image.

The app has a simple interface and easy to use functionality. You can select an image to draw over or use your camera to take a new photograph and then use your finger or stylus to draw over the image. You can use the eraser tool to erase any mistakes and the app will automatically create a transparent layer over the photograph, allowing you to see the original image.

The app has a variety of options to further enhance your drawings such as adding text and other graphical elements. You can also import and trace images from your device or from the internet.