alright.
I am going to talk about the asian guy bust.
here are few critiques.
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first all, you need to see the whole head in the sculpt unless you are sculpting a mask. but since you said bust, I am assuming this is a full head. on your bust, the back of the head is totally absent. this will get in the way when you are dollying around it to see it from different angles. and it will never look right to u if you dont put the whole head there. you need to see a silhouette .
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the face is too flat right now, you need to push the face backwards as you move along to the sides.
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your ear level can never go beyond your eyebrow level . and the bottom line of ears should meet the nose tip level. also try to seperate the ear from the head more since the ear is attached to the head from a really small area most of it is detached.
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the corner of the lips are always more backwards from the middle parts.
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I see that you are dialing in the details for the fat tissue on the cheeks. before you do that, try to get perfect shape for the whole head and cheeks . leave those areas smooth on the round places like cheeks and forehead, tip of the nose, the chin. get the overall shape right with proportions first. then play with it without crushing proportions until you like what you see. and when you get the right volume and shape all around you can start breaking it, bringing in more details like the fat tissue. this will make your bust more realistic since you will have a foundation and then build details on top of it. if you dial in details before you get the overall shape right, what happens is those details will only look right from the angle you sculpted them. and when you rotate it, the magic will be lost.
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although the face has really round features , some of them are really tighter, so you need to get sharper at some places like the limit line of the lips, edges of the eyesockets, the edges of ears and nostrils, the corners of the lips, the limit lines of eyelids, and some sharp dips like the dip between nostrils and cheeks.
I hope these help. happy sculpting.