Shizuka's appearance has changed little over the years of the Doraemon franchise, she is thin, has a light skin color, black eyes and her hair is usually in a black color and tied up in short pigtails. In the 1973 anime, Shizuka is short, has dark brown hair, and in the episodes she appeared in, wore a short, pink dress, white socks, and red buckle shoes.
Shizuka's brown hair was carried over in the 1979 anime (though it became light brown) and her appearance was mostly the same as before, except she is a little taller, (as an adult she had her hair tied in a bun) and some of the episodes had her wearing different colored shoes. Also, in many episodes, wore different outfits than her pink dress while the rest of the characters wore their normal clothes.
In the 2005 anime, Shizuka's hair was changed to black to match the artwork in the manga, and mostly wore a shirt and a skirt, in some episodes she would wear a dress. In the recent movies, Shizuka has brown eyes. Overall, Shizuka's appearance has remained mostly the same over the years.