This Is Amazing! The One Thing I Would Do If I Was You Is That I Would Try Remove That Grain/noise By Her Hair. Im Not Sure If You Already Use Blenders Built In Denoiser Or If You Don’t Use Any Denoiser. A Good Way To Reduce Noise Is To Increase Sample Count. Everything Else Is Amazing!
You Can Enable The Denoiser In “View Layer Properties” Tab And Scroll Down It Is Called Denoiser And It Helps Alot But May Increase Render Times By Abit
And Another Thing I Would Recommend If I Was You Is That If You Have A Graphics Card And CPU Go To Edit>Preferences>System And Turn On Cuda. It Will Use Both CPU And Gpu Which Will Dramatically Reduce Render Times.
This is really good, well done! Maybe add a bot more shadows and make it so the face is more staring at the camera and all of the hair not in her eyes. I really love it.