Hi lussuria! A bunch of people have already given great replies but I figured I may as well chip in my two cents!
There are many criteria on which I judge a model, a few of the big ones are unity, first impression, overall effect, etc. Really their all aspects of the same thing.
- do the colours work together.
- does the scene make sense (this is more in terms of dioramas.)
- has equal effort been spent on all aspects (if the model is perfect but the face was an obvious rush job it will tank the score.)
- is the model complete? The base has a huge impact for me, it doesn't have to be anything fancy but nothing screams incomplete more then a base that just has primer on it. Makes it look like its still in WIP stage.
A basic break down of what the scores equate to for me.
10. This is very rare for me, generally something extra will be needed on top of a perfect paint job (base, conversion, story, etc.) There are a lot of flawless paint jobs on cmon so this really needs to be unique. In my mind its something that would win the highest accolades. Picsters undead giant from the last crystal brush or jarheads recent slayer sword.
9. Flawless painting OR near flawless painting with something of the above mentioned uniqueness. This in my mind is the type of painting that is going to win golden demons etc.
8. Smooth panting, proper lighting, appropriate palate etc. Once again the above mention, base, story, etc. help a lot here.
7. Clean painting, appropriate highlights/lowlights, simple but well based, if in terms of multiple models their must be unity. No mold lines etc. Nothing exceptional is needed but it must be clean and tidy with nothing missed. I might expect to see this in really beautiful armies.
6. High quality table top. Clean and tidy, colours in there boundaries. Basic highlights/lowlights. Tidy base, etc.
5. Tabletop. I feel a lot of people undervalue this and see it as a poor quality paint job, I don't. A 5 should be tidy and based. It doesn't necessarily need to be highlighted etc. but for me the colours need to be tidy and within their boundaries. Often I see models that have a nice controlled base coat and then really sloppy highlights. Even though more has been done it will drop the rating for me. Basically a 5 to me has a basic base and shows good brush control.
I think I may rate things harsher then some but it's not because to me a 5 is a nicely painted mini.
In regards to your miniature from infinity? Currently I would give it a 5 or not vote. The painting is actually quite clean, on top of which it is an exceptionally delicate model to have worked on. The reason for the 5 is that it is unbased, it looks incomplete. Base the model and clean up the edge of the base and it would be a 6. Furthermore, with a small among of work it would be a 7. Your brush control already looks great.
- give her skin some extreme highlights to draw attention and make it pop (forehead, tip of nose, tops of cheeks)
- clean up the hand holding the gun (painting is a little sloppy, flesh tone in gun etc.)
- little more highlighting on the high parts of the gun and right wrist guard. Light isn't coming from underneath her but from above, this comes back to creating realistic lighting and drawing attention towards the face.
- thin your paints a tad more, over all it is quite good but there is a tiny bit of roughness in some areas. Part of this is that it's such a delicate model it stands out more.
- what's going on underneath her breasts? Is is shading or is that part of her uniform meant to be another color? If the latter cool! If the former the transition is a little harsh, a couple more tones between it and the white would soften it up.
- last suggestion, never go all the way to white, stay a few shades under. The eye will be tricked into thinking its white and you will be left with something to use for extreme highlights on the "white" areas. Specifically the tops of her knees, tops of her calfs, high points on the highs and left shoulder, tops of the breasts, and possibly the tops of her shoulder blades/butt unless they're in the shadow of her hair (can't tell with only a front view.)
Shakes