Thank you already everyone for your thoughts!
The reason you don't have a defined jawline is because you don't have a defined jawline (the bone structure of the jaw) and not because you don't appear lean. So the problem in your case (my opinion) is the bone structure and not the other way around. A stronger chin does not result in a stronger jawline but will help with double chin and stretch the soft tissue a bit and could make you appear leaner I guess.
I will try to create a morph of myself to better visualize this, but taking a random picture of google images:
https://i.pinimg.com/originals/58/ee/47/58ee47ad9d9345c4a7f3996bce01d4df.jpg My profile is currently closer to the lower right, but I would like to change it to be more like the upper right image (I care more about my 3/4 profile instead of my side profile, but I think my 3/4 profile would also be significantly improved if the side profile is changed like that).
So what would conceptually need to happen for me to have a defined jawline is that my literal jawline would need to be moved 'down', correct (whether via BSSO/chin wing/whatever)?
[EDIT: Trying to create a morph now but struggling a little bit. Is there a recommended way to do so? (I'm just trying to use photoshop right now, e.g.,
https://helpx.adobe.com/photoshop/how-to/face-aware-liquify.html, and some Apps like AirBrush.]
I'm not sure what the goal would be in your case, but if it's to look more masculine or chiseled just grow a beard instead. This would help with the boyish looks, and it's much safer than buccal fat removal.
So generally my goal is literally to look more 'conventionally attractive' (because I think it would increase my QOL). But your guess is correct: I think what would help me most with being more conventionally attractive is acquiring a more masculine or chiselled appearance. And I think what most keeps me from having a masculine or chiselled appearance is that I don't have a defined jawline and that I have very round (opposed to more hollow, see also the top left vs bottom left in the picture above) cheeks.
(I sadly can't grow a proper beard yet. But I will probably look into a beard transplant after I try to improve my bone structure haha)
I think a mistake I made so far is that I didn't really properly show surgeons what 'after' picture I want. I consulted with a surgeon today and she also mentioned that a bimax would definitely be a risky (and costly) operation for purely aesthetic purposes but she didn't completely reject the idea (especially because I might have some slight functional issues that will be improved by it - apparently I have a slight open bite as well as potentially upper airway resistance syndrome (UARS)). The third option she sees (apart from chin wing or a form of bimax) is doing a long genio/short chin wing (that doesn't include the jaw angles) and jaw angle implants - so the third option I also discussed with my surgeon I was planning to operate with. I acknowledge that so far from the forum it's a clear 'no' to bimax and will take that into account, thank you everyone.
Is there a particular reason why you dissuade me from a bichectomy (buccal fat removal)? I know of the usual risks and asked my surgeon about them but he said that I would be a good candidate nonetheless (and the idea was initially suggested by him because I mentioned the round appearance of my cheeks). I also explicitly told him to NOT remove a lot of buccal fat and basically only do the removal if it appears to make sense when he is operating me. According to the same surgeon, hollow cheeks are generally achieved via forward growth + high, forward zygos + prominent jaw angles + thin skin and very little buccal fat - this appears plausible to me. Would you suggest I only do buccal fat removal, if at all, separately after the initial surgery (or that I even go the opposite route and instead augment my cheekbones)?
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The first drawing is actually the chin wing prediction and the second one is genio + jaw implants if i understand the initial post correct. And i agree that it is not unrealistic.
This is correct; apologies I will try to make it clearer now.
Out of curiosity: Who is the cw surgeon?
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PMed you. If anyone else is curious, feel free to PM me.
Also, apologies if some of my questions are still very naive. I have not found a good comprehensive resource about jaw surgery yet and most of what I know comes from checking the most common face surgeries on realself or seeing a surgery mentioned somewhere in a forum, then googling it.