I would have to say either valve trombone or baritone/euphonium.
I think its B a beach at low tide
Depends on the medium but if painting, this technique is known as Impasto, layering paint thickly on the canvas making the strokes of the brush or knife visible. When dried the paint appears to be coming out of the canvas creating a three dimensional effect and providing texture. one notable artist that used impasto for its more expressive qualities is Vincent van gogh.
