ok she defenintly looks nurgle

There are a couple of things that you need to pay some more attaction on (and I don't mean this in a bad way, only trying to give you some good tips).
First you need to thin your paints more and use a couple of thin layers to get a good color to work on. Thick paints will obscure details and won't look smooth. You will get a good looking mini by just putting one colour thin and smoothly (this may take a couple of layers before you get a good coverage)
Second, try to separate some parts of the mini and be a bit more neat... I mean that if you paint armour, and you slapped some paint on non armour as well, clean it up a bit,and then paint the details. This is to get a good defenition between the different parts. For example: the purity seal on the cloak would have looked much better if it was touched up with black and then painted again to seperate it from the cloak.
Third, try to highlight. This doesn't need to be 7 layers immediatly. Two or three layers of lighter colors will look great to start with (basecolour + some white or bone). Just to get the experience.
These steps are quite simple and will pull up the mini appearance. The best thing you could do is look up some good tutorials on the net, and look at WIP topics and other miniatures. The net can teach you a lot about painting miniatures.
Don't let my post get you down, the mini looks defenitly nurlish, but as you said: you wanted to step up your painting. I think these things would aid you
Try browsing this for some good articles on painting and everything else miniature related:
https://www.coolminiornot.com/article These articles helped me a lot with my painting.
And don't be afraid to ask advice
