Cel-Shaded Roots: The character features the distinct line work and large, expressive eyes typical of anime, but the shading is much more sophisticated than traditional 2-D "flat" coloring.
Volumetric Lighting: Notice the soft, directional sunlight coming from the window. This creates depth and "bloom" (the soft glow on her hair and shoulders), which is a hallmark of modern digital illustration.
Detailed Textures: Unlike traditional anime, there is significant attention to the texture of the fabric (the blazer’s folds) and the grain of the wooden desk.
Depth of Field: The background is intentionally blurred (bokeh effect), a cinematic technique used to keep the viewer’s focus strictly on the subject.