Half body horror and half lesbian romance, Lucky McKee's Sick Girl is bursting at the seems with underappreciated cinematic talent. While much of McKee's filmography is dedicated to the lowly weird girl, his best-known work being May (2002), I think Sick Girl is where his cinematic skills come together best. Let's start with the talent, because I have a lot to say that's contrary to popular opinion. Erin Brown, while constantly being brought into the conversation to say she cannot act, is nothing if not committed to her role. If you've ventured into her filmography, you'll see that she isn't…