As a Designer who is still learning and trying new things, it can be very frustrating at times when you try to drape fabric on a form and just go for it. I think that you kind of do what works for you once you find yourself as a designer. I personally like to use chalk for my neckline and arm holes and side seams, and I hand sew any pleats in place and don't bother marking them at all before sewing. Then I like to true my lines and go from there. Sometimes I have no clue what I am doing, which is always challenging. Like right now I have no idea what I want to do with the back of this top right now.
I am obsessed with this fabric though. Isn't it gorgeous?! It's a jersey knit and light weight and see-through, so I had to make it a top. I am going to work all night on it now that I have lots of free time.
Have a good Monday!