1. You were trying to get more tilted head than it actually is. That twisted your nose shadow and made mouth missplaced.
2. You put on too pale skin, that shade you took is native to 4-8 hours old corpse.
3. You forgot to paint and outline fingers. That was more of mistake from bloom effect SS was taken with.
4. Cross tied shirt stings were too black, and too sharp. Making them stand out on allready gray model.
5. Eyes again. If you wish to get them to shine, use several different color tones. For instance, nearly dark purple, then lavander, and on it max purple. All applied with several strokes of low opacity smudged brush. After that, you take nearly black again, smaller brush (1.74 times smaller, rounded up) and apply it in upper corner of eye. If you apply it on centre, you will get "drugged" look.