Just like during my How To Draw: Butterflies, create a cigar shape for the body and a circle for the head. Roughly draw the wings. Remember, it is not important if they look right or not, we are only focused on the general shape at this point.
Using a pen can make the pattern appear a lot clearer. You can adjust the areas that look tightly squeezed in and is also a good time time to adjust the wing shape too. Some stripes are boldly shaded in, while the dark panel at the top is created using a series of dots.
Now do the same with the other pair of wings on the opposite side. Pencil first, pen second. The challenge is to get the symmetry exactly the same. It is tough, but if you can do one side, you can do the other, too. Spend time to practice and you will get it right eventually.
Finally, it is time to colour in. When freshly emerged, a swallowtail is bright yellow, but fades with age. Make sure you go over the stripes in yellow at the same time. The hind wings have panels of blue, which I dot over in pen. They also have blue and red 'eyes' on the hind wing too. Finish off by using a black pen to go over the dark areas again.
And that is how to draw a swallowtail. I hope your drawing was worth the challenge as was mine. It is a real treat to draw as it is to see. Swallowtails are a true icon of the Norfolk Broads and I can't wait to see them again.