Thanks for the answer Ivan!! Is that I noticed some kinda of idealized proportion of the face and I though that you was looking for replicating another artist (not that it's not good actually is a good way to study ).
Mayyybe my advice could be to study more 1 to 1 photo reference to understand how the volumes works, but I don't know if it could be useful to you because I actually like your works just like this hahah
I just feel that some of your faces miss some bone/muscle structure sometimes. Hope that this doesn't offend you haha but you seem to be really in tune with this topic so, I hope that you will be our master portrait artist of the forum one day For this reason I allowed myself for being harsh, hope that this could help you
And of course I allow you to be harsh to me too hahah this evil comments usually helps me a lot