if you get stuck drawing try your pencil on a different point of view. graph paper is that POV. but it does not have to be squares or rectangles. both are nice but lead to ridged which is fine if you want to draw the grump from UP!
circles, hexes, and dots good.
one trick, and there is always that one weird trick, is to make the grid lines more gray making the guides more hidden when printing. every printer is different. start with 50% gray then aim toward zero.
print some circles.