[experiment 626]

not a bad start! however, that being said some things i heartily recomend you try out to improve on what's there;
a) thin your paints down. this next to learning 're-pointing' your brush are the two main keys to great minature painting. you should never use paint of any kind strait from the bottle (especially inks!) always, always, always water down the paint onto your palet. (btw, what does your GW store use for painting pallets?!)

b) shade/highlight the skin. honestly, it's quite difficult for example to tell where isabella's hand ends and the skull she's holding begins!
a nice coat of flesh ink, perhaps with a bit of dark green ink mixed in and then highlighted up through say elf flesh/pallid flesh/skull white would really look the part!

c) red's a hard colour to deal with in all honesty. try giving the red areas a wash of thined down brown ink and then work back up through scab red ---> red gore.

d) the blue on isabella personally doesn't fit... it's too bright and almost a bit cartooney. (did you use enchanted blue?) try a couple layers of blue ink mixed with a bit of chaos black (and of corse, watered down!) then try highlighting with regal blue as it's a nice dark, moody tone

e) the sword also looks a bit goofy imho in red... keep it metal! or else really, really darken it - take a look through the chaos mortals book and have a peek at the various runeswords/tainted blades.

f) the face is always the focal point of any model. if it's still a bit too shaky to use a standard brush, go to a fine detail brush for such areas.
also, while it's great to see the effort, don't try things like eyes right away as they're that tricky & important! (hell, i still only paint my eyes white and i've been at this for 11 years!)
get the basics of highlighting the face itself; checks, jaw & brow down first. even without eyes, a well highlighted face still looks amazing!

anyways, i hope this helps,
cheers!