I kind of feel like you're drawing the upper torso too large for the body. I did a bit of photoshop manipulation on it to show you what I mean.
Not sure if you can tell from that alone as it's really just some quick tweaking. I didn't bother to make it look perfect so you could see the areas that I worked on, but surprisingly some of the lines still matched up pretty nicely.
Oh yes I do see the line where you shortened it can I ask, is this a frequent problem or just in this particular sketch?
Thanks for pointing that out to me I won't edit the actual sketch as it would take me hours to fix up :/ but i've made a note for future sketches