Lattest atempt.
(whinygitsaboutimagesbecausetheyusetinyscreens)
For comparison.
I quite like your Epsilon Pegasi medal, your Vasudan Imperium medal, your Nebula Star campaign medal (though the light is too bright from the lower right really), All the pins are perfect too, and your GTVA Legion of Honour (although the stars should probably be brighter)
Personally, though, your Meretorious Unit's star spokes are too thin at the edges, NTF Victory Campaign star looks kinda bland and again too brightly effected by the lighting, the reefs on the intel cross are a bit too small, and most importantly, the SoC Unit Crest is too 'primary colour' cartoony, which makes the previously best medal in retail right next to it - look the worst out of yours, the Service Medallion looks like it was designed by the person who designed big bird's looks, the Lion, although it LOOKs like it's more detailed; it's details are super-cartoony, and it's colour is off putting, if it was done right in that style it would still look bad, the coat of arms centre pieces are not meant to be on medals, and the base part of the medal looks like
http://www.kaizenbonsai.com/shop/images/ct1004_spade.jpg <-- ...
So the good with the bad.
The Allied Defence Citation I'm not sure about, I'd like to see it closer up first, but it looks ok, kinda depends on if the galaxy-swirls are on the pins or not.
And I think I'd probably like the Order of the Galatea if it was a bit darker...
The Distinguished Flying Cross would also probably look fine without such highly contrasted colours because of the lighting..