I look at photos such as the one below and while I see the differences, I also note how each shell is similar to the next. What details do you focus on?
Here is another example:
Each blouse is from V 8906, a newish pattern. The envelope art is a bit off putting to me, but I love the fitted look. For whatever reason, I decided to try it in a corduroy and you can see my gritted teeth in the photo! Next up was a turquoise and purple shot cotton=yummy. Finally, I tried it in a B/W floral linen (which I think is from JA) and while the fabric has a few teeny flaws, I love the flow of this fabric in this pattern.
Each blouse follows the basic plan of V 8906-slight peplum effect from darts, a sleeve which is cut on (magyar sleeve) and a V neck produced when buttoned.
Variations: fabric thickness, sleeve length, number of buttons/snaps, width of each dart, number of darts. The red blouse was sewn almost completely as directed, the blue has smaller darts, and the B/W has darts only in the back. Of all of these, I think the 3rd is my favorite, with #2 close behind.
I love the IDEA of the strongly darted blouse, but I am too short waisted to make it work. Better to go for a variation, and let natural selection "choose" the best adapted.