Yes, get to f1.8 with the 50mm you bought? (You did, didn't you?) The car ones look fine and well exposed. The smaller the number, the larger the aperture size, the shallower the depth of field.
But in my opinion if you're going to edit something, spend time and do it properly. The pic of the blue hot rod is ruined by the bad editing. Colour on the grass on the right etc...cropped as well?