CarModelNoob

So I spray painted the body with gloss black paint however the result isn't what I expected it to be. It is only glossy in some areas and most other areas have no shine as you may see in the pictures. Is the problem with my spray paint or my surface preparation? Also from the close up second picture you can see these weird lines on the surface. I actually sanded them before paint however they are still present after. What are they and how could I get rid of them? Thank you!