A free app for Android, by devsmail.

Photo Sketch is a smart tool for converting pictures into drawings. You can choose any image from your gallery and convert it into a picture or pencil sketch in no time.  It is one of the best drawing apps that will let you create beautiful pencil sketches by converting your photos. This smart application is a fast and easy-to-use tool to create beautiful works of art. All you have to do is take a picture of the object you want to sketch and then choose a pencil of your choice and color to draw it in the desired style. Use it to share your gorgeous images with your buddies around the globe via any other mobile social networking platform.