I really like the castle in the background of this, and all of its detail! The sock looks great, and are really eyecatching, as is the dollything! The hair looks nice, but it needs more detail, and possibly some more shading on the entire picture would improve it. The wings are adorable, and such a happy expression. The expression is very cute, on both the full size figure and the smaller one, but the colouring could do with being slightly more even. You might also want to focus on including a major lightsource? But I really like the shading on the clouds. I like the ribbons and the detail on the outfit, and Rin makes an extremely cute overlord!