Messy lines, lack of clarity, distracting background, unclear composition, overly complex design, lack of balance, unrealistic proportions, inconsistent line thickness, lack of attention to detail, lack of precision, dull atmosphere, lack of depth, cluttered appearance, lack of focal point, unclear purpose, awkward positioning of the saxophone, lack of symmetry, unnatural angles, lack of shading, lack of contrast, illegible signature, misplaced signature, disproportionate parts of the saxophone, lack of sophistication, lack of artistic flair.