I like 'em! This is one of my fav styles of photography so I'm a bit partial.
For #1, she's very separated from the background. Maybe try overlaying a bit of a grunge effect & desaturate slightly so she matches the background better?
#2 is the best of the bunch to me, a nice classic pinup look. If I'd change anything here I'd say a little less space below and more space above.
#3 her pose seems a little awkward, and the crop doesn't seem quite right, but it's close on both accounts.
#4 I'd like to see a slightly different angle so the lines of the hearses body draw you more to the subject, at this angle the landau bar is a distraction but if it were more visible it'd help lead the eye to your model as well as make the hearse more a part of the scene.
#5 you might consider rolling the window down or use a circular polarizer to get rid of the glare.
#6 is a good one to me, only problem there is like mentioned above the model has dirty feet. Clean that up in post & you're golden.