The vampire looks great. The paint job is clean, the cloak has some cool gradients.
Personally I think your nurgle stuff looks better, but I don't think this looks bad. It might be an opportunity to push your skills...
If I could give you any tips at all, it would be:
a) your photos sometimes look very harsh, especially with the black background. May try a different / textured background, so the lighting doesn't have to be so overly exposed. It might bring out some details.
For your nurgle army, this kinda works because most of the colors you use are deeply saturated and dark, so the highlights pop nicely. But this guy has a bunch of high-value / white colors, so they blend and the whole mini looks flat.
b) Some smaller things: I think you could "shape" the hair a bit more, from a lighting perspective. It looks very flat (but again that could just be the photo). Typically, hair is very shiny, especially on an oily vampire
so it reflects light
the same way as metal, with sharp specular highlights. At least, that is what I've read and what I'm trying to apply when I paint hair...
Also the face is all cheekbones
and while I know he is undead, the face is where we focus first, so it should look a bit more... alive?
c) color choices: this is not a critique, but some people will perceive wild swings between color hues as "childish". In this model you have yellow, purple, blue, red and green.
Don't get me wrong, this can work - just look closely at BaM's work, he has at least that much going on just in his barbarian's lion coths
but he uses them in a specific way.
I think if you tried to stick to say two or three colors, maybe picked from a set of complimentary or analogous colors, and varied their value and saturation, your skill will shine brighter.
d) brush size: for tiny sharp details like the stars on his cloak, there is no going around it - if you use a thick worn-out brush tip, you will get round blobs instead of sharp stars.
(At least, I think this is what happened here)
For small details, you are gonna need a smaller brush and thinner paint...
If you were free-handing a dark logo on a bright surface, you could use a fine-tipped marker to draw the outlines, but in this case you are stuck with white paint. So brush size it is.
I loved your He-Man figures, I think you did great there.
But I am looking forward to what you do with this new nurgle guy!
