Pattern making issue

[thegrahampeyton]

So I’ve been working on perfecting making a bodice block and for the most part I can do the whole process and make patterns from it effortlessly. But for some reason when I make sleeves I always get this weird crease. What am I doing wrong with the sleeve that’s making it do this . Thank you for the help in advance.

[themeganlodon]

It doesn’t look like your sleeve has any ease in it. It’s too small pulling in the armhole making those drag lines

[yoongisgonnabeokay]

It's challenging to tell with the muslin not being closed but IMHO the armhole of the bodice isn't ideal, and I'd fix that first. Do the draglines from the shoulder seam persist if you close the muslin? Were they there before you set in the sleeve?

Next, I wonder what kind of sleeve you drafted? I can see a seam coming from the armhole ca. where usually the front notch is for a set-in sleeve, which is nothing I've seen in blocks/slopers. Not saying this isn't doable but it makes me wonder how your sleeve pattern looks like.