EDIT: MAN!!! @$$%@#!! I just wrote this big post with advice for each tank then accidentally opened another site in this window to give you links for help but the post disappeared!! Frustrating lol. I will reproduce it the best I can.
Ideas: Tank pic #1: I would leave your water sprite where it is, but I would say it could use some mid and foreground plants. I would tie some anubias or java ferns to your ornament at all levels of the ornament. It is a nice ornament, but it might be to short. Not saying get rid of it but I would try to fix that. With it being only half as deep as the tank, which is already looking deep, it makes that space above it even more empty. However with some java fern tied to the top and once your watersprite grows in it should fill out the top
. I think this will help the tank fill out. For the foreground I would say you could use a moss mat, or maybe some anubias.
Tank pic #2: Busy busy busy! hehe This tank looks a little unkempt
. It is hard to make any suggestions as it is hard to see what is in there and where, but the grassy stuff up front along with the crypts on the front left look quite good where they are. Once you move some stuff out it'd be easier to help out with it
.
Tank pic #3: I like it a lot! The grassy stuff up front looks really good, and hopefully the swords fil in the back and top and then it will look really good, with some open front-row center swimming space. Fair warning though- those swords will get bigger than your tank if left to grow :P. Be sure you keep it trimmed back if it gets to that point or it will smother your fish.
Tank pic #4: I think your stocking plan sounds good enough- but I don't have much experience with stocking small tanks- sorry. Plant-wise, if you wanted to get rid of those plastic plants too you could use some of the stuff you trim from Tank #2 and put them in- I know my betta loved the live plants I had.
Tank pic #5: Well you could put some cories in with her if you wanted. I think that'd be a good move on many levels- clean up, having motion on the bottom, having something cute to look at. Aquasaping-wise I would add some plants that will grow to about half the total height on the right and left- two different species. Some bigger crypts would look good IMO. Then in front of the sword I'd put some java fern or something else- something that won't grow very tall so the sword gets shown off, not it's stems. Then you could us a moss mat or maybe some of your grass *gasp* that's what you could do. Use some of the same grass from Tank #3 and put it on the bottom in front of the sword and java fern or whatever goes to cover up the sword stems.
Aquascaping Advice: For taller tanks such as your hexes and the first tank, you want to make it look a 'normal' height. So tall stem plants like rotalas, bacopas, hygros, along with other tall plants like swords and vals go a long way in making it look shorter. Crypts do well for midground plants as well. With your rectangular one, it is too hard to see what is going on lol. There is so much in there and the plastic ones are hard to tell from the live ones, so it is hard to give any hints on it until some plants get taken out. You have a lot of hornwort that could be trimmed though.
The best thing to do IMO would be to look at other peoples' tanks that are similar to the size of yours and see what they have done. This should help you get an idea of what can go where and look good to you. Here is a link that I use a lot to see what people have done with tanks like mine:
Plantedtank.net: Tank Gallery. It is hard to 'scape small tanks such as these, so I would advise just looking around and getting ideas from others.
Now don't let me give you the wrong idea lol. I just realized I gave a lot of suggestions and ideas to you. I do not mean to say that you are doing anything wrong. Your Tank #2 could use a little TLC, but other than that everything is looking fine