Now, take a 2B pencil and draw over the outer lines with a darker tone, this will evaluate where exactly you have to place the shadows in the correct order. Use the darkest of tones in areas where the shadows will cast (inner leg, 2nd further back wing, underneath the eye). Using an HB2 pencil, lightly shade over the entire drawing. Afterwards, take a cotton swab or Q-Tip and blend in the shadows.