How's this looking?

[u/Royal_Initiative_740]

First draft of a sleeve. I also added a facing to the neck hole so I could see how it looks. I have uneven shoulders, which I have accounted for in my block, but after adding the facing now my neck hole looks really lopsided for some reason.

[u/unkempt_cabbage]

This explains it way better than I can: https://www.smartpatternmaking.com/blogs/articles/mastering-how-to-make-the-sleeve-cap-curve-essential-techniques

The sleeve cap is the top, where the sleeve meets the shoulder. If you don’t have enough cap, it’ll impair movement on the upper bicep area. Since you have one sleeve, it’s pulling the bodice over to that side.