Dark cloth does not show details.
It is best, when learning, to use lighter cloths.
On this screen, in this thread, the pictures are useless.
From what I've read it sounds like you've got a nice shirt coming along.
Yes I realize now that dark cloth isn't ideal. On my moniter, though, I can still quite easily see the issues: multiple tight small folds at the lower half of the back sleevecap, and larger twisting folds on the front. I guess it depends on your monitor. Next time I'll know better to get a lighter cloth...