Well, I will offer my comments then
I think that when you are planting a forest, the general practice is to plant trees that are almost "finished." That is, they've achieved desired caliper and have been wired. It would be better to grow each tree separately until each on is ready instead of developing them all in a grow box as a forest because the former would allow the trees to grow faster.
The major deficiencies that I have found in your forest are that the trees are the same size, the positioning does not reflect mush depth or perspective and each tree is not ready for a bonsai pot. You should read the many availible articles, book chapters, forum discussion, etc. on choosing trees for a forest, positioning, and preparation.
I hope that I do not discourage you from trying more forest plantings, but it would be a disservice to you to be anything but forthcoming. I do commend you for trying to and submitting your planting to the judgment of others, that shows that you are really willing to learn.
good luck