>>6307495I always wanted this too and personally never felt like I achieved that, because the theme I have for my dolls is very restricting. However, a while ago I had to put them all next to each other for cleaning their cabinets, and I was pretty amazed how they look together while each of them is very different.
As long as your dolls aren't all the same face with all the same boring style (i.e. ten MNFs all with Andreja lookalike face-ups and simple casual clothes from etsy) everything is possible.
Different, together well working companies*, styles that reflect their character (if they have one), posing them properly on pictures, letting them look like you know what you are doing and doing things on purpose helps to get across that "cohesive together, yet individual" feeling.
Your own taste will make it look cohesive, because you tend to gravitate to certain things anyway. The individual part is the one you need to do on purpose and with putting thought into it.
At least that's how I feel when I look at other people's collections who fit that theme. Their dolls are unmistakenly theirs, and things just make "sense" when you look a little deeper. The way they dress them up, photograph them, certain accessoires.
It does work easier though when your dolls have a character or background. If I had none, I just made them one for styling purposes.
*I know that can be hard when you pretty much like company X the most, just try to search what fits your vision best and avoid to default for company X just because they released a new doll and you have a slot to fill.