Portraits und Zeichnungen leicht gemacht mit der Methode des Rasters
The grid method is an inexpensive way to reproduce or enlarge an image that you want to paint or draw. With this app You can draw a grid over any image, then draw a grid of equal ratio on your paper so You can draw the image one piece at a time.
Unlock ads free version here: https://play.google.com/store/apps/details?id=it.nullpointer85.android.gridDrawing.pro