I think a big problem is maybe your picture quality. Most of the pictures are blurred, and prehaps look a little worse on the photo than they do in real life.
For example this first picture doesnt look too good, however the second one looks great in comparrison (I especially like the skin and facial tatoo), even though its exactly the same mini, with exactly the same paint job. Which makes me wonder if some of the other minis you posted also look a lot better in person?
Click to see full-sized image
Click to see full-sized image
Does your camera have a Macro function? Most digital cameras come with this function nowadays, it gives you a much sharper focus when photographing small objects like minis, and eliminates a lot of the bluring you generally experience when trying to take close up shots.
Lighting can also make a big difference, I noticed that the top picture that doesnt look as good has a big shadow behind it, where as the nicer bottom picture doesnt. Are you using a flash? That can often make minis look a lot worse (The light tends to be too harsh, and can obscure a lot of detail).