Use your sights to level the picture. You can see the line in the background is slanted.
Then on lightening, I agree with
@azurbanclucker. Move your lightening around. Something I've been using for my car photography (it's not anything professional, sorry) is I have a five bulb lamp with LED light bulbs in it. Put it in the right place and move each piece to wherever you see the lightening best. Try not to point the lights directly at the car because it can brighten up the car too much. If the lamp shades are glossed like mine, it works best to point each bulb to the side and shine through the shade for the lightening.
With the reflection, you might not want the lamp above the car in any way, but around the car. Reflection pictures can be hard because they can show anything, including things you don't want. Positioning of everything is key.