Wave study by Claudia Nice from her book: Down by the Sea with Brush and Pen: Draw and Paint Beautiful Coastal Scene… | Watercolor paintings, Painting tutorial, Art
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JZMAX Art Supplies Watercolour Brush Pens -[20 Watercolour Pens+1 Brush], Calligraphy Pens with Soft, Flexible Nylon Brush Tip, Professional Brush Pens, Watercolour Pens Set, Colouring Pens, Art Pens: Amazon.co.uk: Office Products