Transformation using grids

Today we got to draw a picture using grids and we could either use polyline or curve line and selected one to draw our picture but we got to do a koru and a tree to do before we did our own picture. I thought that the koru was hard at the start but then it was easier and the tree was harder because of the shading of the colours, but then it was fine.
Have you tried to sketch a picture using grids?