Draw a few long, narrow triangle shapes hanging downward from a roof edge or branch
Vary the lengths and widths of the icicles
Make some tips sharp and some slightly rounded
Add small uneven curves along the sides to make them look natural
Draw a thin line at the top where each icicle attaches
Overlap some icicles to create depth
Add smaller icicles beside larger ones
Sketch light vertical lines inside each icicle for texture
Shade one side of each icicle lightly
Leave thin white highlights to show shine
Add a few drips or broken tips if needed
Darken the attachment points and lower edges for contrast