Ok, I like some of your trees, there is real potential in some of them!
Please do not take what I say the wrong way as I just want to help you and looking at a struggling tree or something that just flat doesn't work and telling you it is "really good, great job"!! Doesn't help anybody... So please don't get your feelings hurt, I am not a master of anything except what NOT to do because I have probably become an expert at most the mistakes one can make as they learn Bonsai... I do know a little and I have learned a lot from people here telling me when I screwed something up- so please, don't think I am talking down to you or something!!
1. The Japanese Maple... Just doesn't work man. The exposed roots? Looks like the tree is struggling to live. That is a young tree that should be planted in a grow box or in the ground for a few years to get thicker. Once it is thriving, get it out of the ground/ container, wash the roots off and CHOP THE HELL OUT OF THEM! Go hard like they stole something from you! Consider doing the same to the top- chop to a low branch/ Node if you want some wiggle in the trunk, if not, cut those branches real low and develop the crown progressively. Then put it on a tile/ board/ CD/ frisbee... Something flat and let it grow some more! After a couple years you will have a nice flat root base, a bigger trunk and you can start worrying about developing the top... Feel free to leave it the way it is if it pleases you, but I fear the tree will not do well in it's current situation.
2. Invest in some wire.. Those Junipers need it. You have some decent trunks and deadwood features on a few, but every single one needs to be wired out. If you don't have the time/ patience/ experience to wire them out to the tips, build to that over time. Start at the bottom and work up.
3. Looks like you enjoy working on deadwood and did a fine job on some of those Junis! I think you could shorten some of it though... Movement and contrast are appealing not necessarily length. Carve them down with ruts, fissures, scars... Tell the story of damaged trees... Burn them out a little with a torch to both harden the wood, add some grey color... You still have the stark white contrast, but the various shades within the deadwood you get from burning it show the grain of the wood, the carving work you do... Adds interest.
You have quite a few trees, did a good job on your stands, have a big old honking trunk on a few... But I assumed you wanted a little advice and again I hope you understand I just want to help you out! Hopefully more people will chime in with specific advice, I just wanted to give you some general tips that might help you when working on most of your trees...