Before talking about your painting, here are a few things I think that could generate more interest into your minis :
*) Don\'t post blurry pics (the vehicle ones and the first Cadian ones are OK);
*) Take the time to remove mold lines;
*) Drill or paint the gun and exhaust holes.
For the painting side :
*) Judging from the banner of the Space Marine Captain, I think you need to thin your paints, particularly the white. I\'d also shade it with a light grey;
*) Though your yellows look OK on the marines, I think they could use a bit more contrast and some localised deeper shadows (around the eyes of the eagles for example);
*) Similarly, the red cape could use deeper shadows. Try mixing some purple;
*) The vehicle looks cleener/smoother than your foot troupers. The next step would be to highlight it a bit more and, if you judge necessary, to add some mud, dust, oil marks, or scraped paint effects;
*) I think it\'s a bit early to say something on the Cadians, but the difference in color between their uniform and the color of the ground is too strong. But maybe that\'s what you want. I\'d keep the desert and red colors and replace the green grass (?) by desert, earth, or grey gravel. Something more neutral.