This is, quite simply my untrained opinion, and you're free to take it or leave it. I think you're overdoing the highlights, and don't have unified lighting for the whole model (for both your models).
For the red marine:
The OSL is way overdone. There's no way the light from the eyes would shine on the forehead, and the OSL light looks just as bright as the eyes themselves. You would probably get better results mixing the bronze and green before applying than layering the green over the bronze.
The white joint-things are way too bright. There's no way the joint on the back of the knee would be completely white, in shadow.
The weapons are a bit boring. They don't need to be completely metal! Try doing a few grays for everything except the working bits (barrel, bolts, teeth).
The scripty writing isn't fooling us at all. You don't need to actually write stuff, but I think short vertical lines or more variation in height would be better than long horizontal lines. I believe there is a tutorial around here somewhere.
You're going to hear this until you finally give in. The bases really need to be much better, and you might even be hurting your score over a plain base. Those rocks actually look a bit like gravel (minus the white/black) or coal, and have their place, but not covering the base.
Librarian:
I agree that this mini looks better, but you've still got some of the same things going on. Obviously base. The lighting seems completely random, at times contradictory. I'm not a fan of edge highlighting like that, but to each his own. The tops of the thighs look especially over-highlighted. You could probably go darker with the blues, as it seems to jump from blue to black.
I do think you should be looking at minis which are significantly higher score, rather than close, if you want to improve. Here are a few random ones, which show shading, more interesting weapons, and unified lighting source:
http://www.coolminiornot.com/281165
http://www.coolminiornot.com/281326
http://www.coolminiornot.com/281328
yaya. most of the stuff you say is just nitpick details that most people dont even notice or care about.
that ultramarine standard is VERY nice tho. the low score it has is insulting. that model is high 7, low 8.
You say that while posting on a website where people spend all day nitpicking details on minis. You also asked what made the other mini better, but don't want to hear what would make yours better?
You'd be hard pressed to find a "regular" marine above 8. Two examples I found were (pay attention to the comments I made on yours!):
http://www.coolminiornot.com/274047?browseid=62926
http://www.coolminiornot.com/262603?browseid=62926
Is it possible your scale is simply skewed?
I forgot to mention, your red marine is photographed about 2.5x larger/more zoomed in than the librarian and the brown one you linked. That's probably hurting you more than helping. Try photographing the red marine the same way as your librarian and see how it turns out.
I'll admit one of the things I find daunting about CMON is that you need to be able to do several things well in order to score well here. You need to pick a great mini, paint it well, provide an interesting and appropriate base, and then take a good, well-lit picture of a small item and correctly post-process it to look good. Folks who score well on CMON are doing a good job at a several diverse tasks.
You say that while posting on a website where people spend all day nitpicking details on minis. You also asked what made the other mini better, but don't want to hear what would make yours better?
that one isnt better at all. let me get my bases looking better. id be willing to bet you money that mine would sell for alot more money on ebay than that emp. champ.
A few things here;
There's a general consensus on these forums that you don't denegrate or 'slag off' someone elses mini when comparing against your own,
secondly its also "bad form" to make rather arrogant statements like that ebay one,
also there are a lot of people here making suggestions, which you seem to be responding to in a somewhat offhand and dismissive manner. People have taken the time to type out these suggestions, you could do a lot better by responding to them less defensively or with more consideration to what is being said.