How to score 5 out of 5 in diagrams?

Biological diagrams can drawn out of some basic shapes and lines.An accurate diagram with exact proportions, neatness and labeling always deserve out of marks. I have explained all possible diagrams, step by step in my blog www.drawitneat.blogspot.in  .Recently I have included "How to draw Male reproductive system". I am looking forward to post drawing tutorials from +1 and +2 syllabus. I included tutorials on drawing, Human digestive system, Brain, Kidlneys, Lungs, Ts of spinal cord, Reflex arc, Nerve cell, animal cell, plant cell and many others. I hope you can just take a look, book mark it for later referencing. Previously this blog was diagramsmade easy but I changed it for reason to keep name simple and catchy.