The concept is beautiful. The only issue I have is that spring has a grown-up woman's head/face and neck on a child's body. Thus when viewed up close, her body seems out of proportion. However, since this was only made as a test and for fun, it can be overlooked as long as one does not look too closely.
This is a really nice piece. Spring really pops against old man winters backdrop. I also love that you made her dress the green of spring and gave her red hair. It's a nice change of pace from spritely creatures that have vines/grass and flowers for hair. ^_^