A clean vector sheet showing three different sketch concepts (scribbles) for a rock festival logo layout. Pencil draft style on paper background. Concept 1: Modernized retro microphone with clean sans-serif typography. Concept 2: Stylized guitar pick with bold modern heavy metal lettering. Concept 3: Geometrical shield emblem containing a simplified microphone icon and stencil typography. Professional graphic design sketch presentation, clear outlines, layout storyboard style. See more