I use the same website for school. And I’m doing this rn. All u need to do is basically get a comic strip (any) and print them (print 2 make one of them 3x bigger) then draw a grid on both then maybe trace them so it looks like u did it? I hope this helped.
Steps:
1. find a comic strip
2. make two copies on the same paper; one three times bigger than the other
