regarding your painjobs:
they're really nice, clean and neat. I think my favorites would be the Blood Angels guy (sanguinary priest? Adonis?
), the orc standard bearer and the kroot in power armor.
why are they the best of them all? because you used highlighting and shading on them in the most effective way - you emphasized the shapes of those sculpts to make them look more interesting.
as we often say here - painting models in this scale is mostly about exaggeration. you need to overdo most things to make them interesting - so your contrasts need to be overdone, lighting is best when it's dramatic, etc. make it all too subtle and you end up with flat or boring miniatures. that's the most important point.
now take the chaos sorcerer - what is he like? he's flat, he's boring. maybe your painting is precise and clean here, maybe it's detailed (but we don't see it on your photos) but it surely is too flat.
maybe the sorcerer looks like this because it's unfinished. that's fine - but at least it serves as a good example of what you should watch out for
now compare these two miniatures and their black-and-white versions. pay most attention to those B/W pictures. which one looks more interesting? which one is boring and monotoneous? which parts need some more work? which are fine already?
Click to see full-sized image
Click to see full-sized image
Click to see full-sized image
Click to see full-sized image
of course it's just a simple trick to find what could be improved and it gives only some basic hints, but it's a good starting point for improvement.
and more can be discussed when we see bigger photos of your minis. not necessarily bigger photos as such, because we simply don't need to see the empty space around. simply crop them and then resize. do you know how to do it? if not - ask us
