Sun sets on another semester

I know corny title. I took this photograph walking on campus. I really like the skyand how everything else was pretty dark. I tried to lengthen the shutter speed on my digi can so i could capture the colors of the sky better and it worked. I took about 6 other pictures of the same thing, and this one is definately the best. I did not enhance it or anything on the computer. i just resized it as always comments/constructive criticism appreciated.