Your avatar 3D model is blurry usually due to low polygon count, low-resolution textures, incorrect rendering settings, or over-compression during export.
Low polygon count causes jagged edges that appear blurry; low-res textures make surfaces pixelated; disabled/low anti-aliasing leaves rough edges; over-compression strips detail when saving.
Try increasing the polygon count slightly, using 1024x1024+ textures, enabling anti-aliasing in your tool, or exporting with lossless settings to improve clarity.