How can I easily draw the nephron diagram?

For drawing any figure of biology, you need to first of all understand its theory. In case of the nephron figure, the parts of the nephron and their functions should be known before you attempt to draw the figure. Once you are thorough with the theory aspect, you will begin to find the figure easy to draw. Also remember that constant practice is needed to gain mastery over the figure. In case of nephron, draw the Bowman's capsule and glomerulus first followed by the tubular part and collecting duct. Then you can add on the renal artery and branch of renal vein.