I think, ShutterSpeed is right. While I have only just typed out a comment on someone else's sunset photos which said "when you subject is a phenomenon in the SKY, give that very sky the most room inside your frame", but here I feel you "followed my advice" (which you didn't know anything about ) a tad too far. The "anchor" could have been "stronger", the silhouetted trees might have taken up some more room at the bottom.
Your sunset much reminds me of one I witnessed almost 2 years ago (and it was so beautiful that I will never forget it) ... but I'm not sure my photos are still on here ... Oh, they are, I_found_them !