Thanks for posting this question, it covers territory that can often be hurtful, misinterpreted, and often misunderstood. It was polite, to the point, and professional, as were the replies.
I agree with the others in that the tree as presented lacks foliage detail, the trunk and exposed roots are excellent, I also like the pot choice. Once you refine the foliage, creating more ramification and obtaining some leaf reduction, this will indeed be a very nice bonsai. I hope to see this in future contests.
If I may make a suggestion, post this over at http://knowledgeofbonsai.org/forum/viewforum.php?f=68
where Robert Steven gives styling advice. He has done some remarkable things with material such as this and listening to him and the others there may bring some ideas into play for your consideration. If nothing else, such critiques can confirm your own path.
Thanks for entering the contest last year, and thanks for posting this question, it was a great one,