hello, i am pretty new to 3d printing and i wonder what i am doing wrong.

see: https://www.dropbox.com/s/4i1xylt9yr...33.16.jpg?dl=0

i printed this darth vader laying on the back where the strings hanging down and i printed it on a anycubic i3 mega with:
material: PLA
nozzle temp: 215°C
fan: 100%
speed: 100mm/s
support: lines from table
thickness: 0,15

any other informations required?

what would you recommend to change to get better results?