It looks very good!! I would say it is still a bit flat, so adding more colors would probably help. Overall it is very nice!

Can we see the reference?

I think you've done a good job, I especially like the way you've only hinted at the hair and the body, letting all the attention fall on the face, which I think is well constructed and where I don't see all your difficulty in using colour. Maybe the part in the light is a bit too overexposed (I guess the reference was like that) and you could have put aside the reference and built up the planes a bit more. I like it a lot anyway.

Hi! First of all let me say that your portrait is super cool! I really like what you did, great job! The artits you mentioned are incredible, Yizheng Ke is probably my favourite digital portrait painter! If i've to be picky about your work i'd say that you could adjust values a little bit and maybe some proportions here and there if you want more likeness. Avoid using pure white and pure black if you can, they usually "flatten" the image. Also, try to use more saturated colours in the area you want more attention. If you want a more "painterly" look (i guess that's what you aim for, considering the artits you mentioned) you could also lose and change some edges. Can i do a quick paintover to show you what i mean? I feel i'm not really great with explanation lol