First look is very nice.
I've looked closer to the picture, adjusting slightly the contrast and lighting (darker) of the photograph to what I would think the real painting is...... What is below is not a criticism, only what I would do myself, having your paint in my hand, to attempt to give a bit more 3D effet ...
The transitions (blendings ) between shades and highlights on the skin are too visible, too strong, if you look closer to your paint... With acrylics, it is a long work by adding layers very diluted (I used to dilute 1:7 to 1:10) with repeated layers, (dip brush tip in diluted paint, take out liquid on a soft paper each time, then apply this slight film on the surace, let dry 30 seconds and repeat, reducing each time the surface) .
As Glen noticed, your shadows would gain in being marked a bit more in the hair, face and clothes .. and also in the neck, shadow of the chin on the neck, as the light seems indeed to comme front the left up, but in front of the head. Don't be afraid to go even close to black or almost in shadows, it will give more 3-D to our painting ...
Also you could bring a shadow on the skin under the jewelery adn the chain to mark the shadow from the light (= a lining) of the jewelery to make it visible, therefore 3D on the skin...
You painted the bust cloth at the very bottom with a pure white, with some grey shadow at the bottom. It is the most distant part of the character from the light, so should rather be grey than white, and the bottom shadow rather on the top edge, dark and thin to indicate a shadow line from the violet edge of the tissue. Also the white is attracting the attebntion on that point, although has no interest for the overal subject .... so make it more neutral ... Trace also a thin dark blue (like indigo) line on the vertical séparations right side 'like a thin shadow of the tissue.
But again, do feel to change, it is just to explain if you do one more bust, what could be further enhanced in some aspects....
I am just a recent painter, but get many comments from my pairs in the figurine club helping me to improve. Sometimes indeed, I don't change the current painting, using the suggestions for the next one, to help me to see the evolution in the painting, but some small details are changed, keeping a photograph before, and after, to see the effect. I do often bring the change on a picture, using a software like Photofiltre, to "spray"' the change as a simulation, before bringing the paint on the figure ....( I can send you by PM this trial ...)
This hobby is a real passion, and at least with acrylic, colours do not change with time, like oïl, where melting goes on further still a few days after the painting, and the contrasts are fading away slowly, requiring ongoing corrections until stabilized ....
