Looking at the picture it's hard to appreciate certain things because the resolution is very low.
What I can appreciate is the level of craft that the costumes have, they are well made, color tones are very true to the original art, I'm not sure if this was possible for you or not because I know that it's difficult to make if you don't have the tools to do it, since they are wearing armors the ideal material to make it with would have been with molded glass fiber to create the illusion of real metal, but in any case it was well executed with the materials you made it with.
The props look accurate from the distance, but like I mentioned before, the resolution is low and the picture is small so I can't really judge 100%
What I can see and it's a little let downer is that the expressions on all you are mmmh non appealing, Hikaru is making face that looks like this: =/ her personally is being more cheerful so a smile would have been much better. Umi has a angry glare, she is not as cheerful as Hikaru but she would have gotten a little smile like this not so much as this . Fuu is not looking at the camera, I guess she was distracted? her hair should be a bit more dark blond than light blond, but it all depended on availability you guys had of getting one in that tone, so it's understandable. what would have been better was to remove those curls from her, she does have light curls but at the end of the hair strands going inwards and not in swirls.
Poses look good, everything is pretty good, just the facial expression issues I mentioned earlier.