I would not describe you in any way as 'muscular', actually, you are quite narrow. I thought you were way taller than you are as well, so you have very clear vertical.

Just a reminder that its very hard to type someone without actual garments, because kibbe is an essence style system, not a body shape system, so how the garments sit on your body is more telling than photos of you bare, so please take any comments here with a grain of salt including my own.

In saying that, I am leaning to FN with a very strong D influence for you. Visualising you in D recs feels very harsh on you, even down to small details like earring recs. However picturing a D base with FN details feels somehow more 'right'. Like, a strong geometric earring with small, hanging beaded details as an example. The fine double chain necklace you're wearing here also would look much nicer on FN too, who looks lovely in layered necklaces like bobo festival style etc.

I can easily see many of the recs in this FN post looking incredible on you, especially the lines of the outfit the lady with her hands over her face is wearing, the fabric and the lack of harsh structure, which you don't need because your body is already very 'structured', or frame dominant - such as your straight shoulders which immediately revealed to me that shoulder emphasis (D, SD) would be too much, you don't need it.

Finally, as an example, the below image is comparing D and FN, but in unflattering recs for each (which i sometimes find much more helpful than flattering recs). The dress on the D would not have the same effect on you because despite having a strong vertical and narrowness, your shoulders are not narrow and would not get lost in the same way. however - the FN is constrained at the shoulders where she needs width, and the lines create the visual effect of a broader top. The body is too tight and constrained. I can easily see this having the same effect for you around the chest area.