You've improved at the stuff people don't really focus on, like skin colours looking normal, shading being more naturally placed, highlights and shines reacting well to the type of lighting, the colour of shadows, softer lighting and shading Stuff most people don't care to even think about. Then there's your proportions. Usually they are great, a few exceptions, but not a year ago, your characters had giraffe necks, and the length varied depending on the picture. And the limbs are less spindly and lanky, and they are more consistent picture-to-picture.