Портреты и рисунки легко с помощью метода сетки
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