Unrealistic hair color, flat shading, lack of detail, unrealistic glasses design, amateurish artistry, dull color palette, poor use of high contrast, disproportionate features, generic appearance, lack of realism, lack of facial expressions, awkward pose, unfinished elements, lack of depth, unconvincing hair texture, lifeless eyes, lack of visual impact, weak color choices, mismatched color scheme, lack of attention to facial features, unnatural lighting, lack of style.