Another of my 2D graphic design

This time…is 100% photoshopped and illustratored, no other external files…

BTW…just want to ask you guys who is good at illustrator:h: , whenever I try to save to the pdf file, the faded transparent lines will become not fading anymore. It looks like a normal line with 100% opacity instead of what I adjusted in illustrator (which is 70~40), and it looks horrible.