: Use a contrasting color for the folds to make the "expansion" effect more striking.
: Reference the official video to draw keys, buttons, and decorative patterns on the end caps to match the instrument shown. Visual Inspiration climo_accordio_2_official_video
: If you want a more realistic look, use metallic markers or foil paper for the grill and trim. : Use a contrasting color for the folds
: Glue each end of your folded strip to the inside faces of your end caps. Hold them firmly until the glue sets. climo_accordio_2_official_video