Step 2 Create a new layer named ‘decoration’. Draw a curve with the Pen tool (P). Duplicate it by dragging with Alt + Shift held down, then hit Cmd/Ctrl + D a few times to duplicate the result. Select one set of end points and bunch them together by averaging positions (hit Cmd/Ctrl + Alt + J and check ‘Both’). Select all curves and go to Object > Path > Outline Stroke. Use the Eraser tool (Shift + E) on them as needed, and change their fill to a gradient. Select all again and go to Window > Transparency, then choose Hard Light from the drop-down menu.
You can add another set of lines with a different gradient; try moving multiple anchor points and experimenting.
Step 3 Draw a straight line with the Rectangle tool, and another one aligned to it but a little thicker. Give the thicker rectangle no fill. Select both and drag-and-drop them into your Swatches panel (Window > Swatches). Select the new swatch and draw an ellipse with the Ellipse tool. Go to Object > Transform > Rotate, type 45° in the Angle field and hit OK. Make a couple of line swatches with other colours and place them in the image on your ‘decoration’ layer.
Step 4 Using the Ellipse tool (L), draw an ellipse with no fill. Go to Object > Transform > Rotate, enter 12° in the Angle field and hit the Copy button. Press Cmd/Ctrl + D several times until you’ve gone round all the way. Select the whole shape and group it (Cmd/Ctrl + G). Make a copy, go to Object > Path > Outline Stroke, and move the result to the leg, erasing most of the shape so it fits nicely. Repeat the shape elsewhere in the image where you think it will work. You can also experiment with the Transparency style (Window > Transparency), for example, by choosing Hard Light from the drop-down menu.