Good work with sketching outside of your comfort zone. Cars can be a difficult thing to draw (I still can’t draw them), but I’ve heard that sketching them will make you better at sketching everything, so keep it up!
I’d like to see you clean up the line quality on these. It feels like you’ve drawn each line slowly and carefully which makes it look scratchy. Try to draw long flowing lines from your elbow and keep your wrist stiff, even if the line doesn’t end up where you wanted it. You can always draw it again.
Also have a think about what details you’re trying to show with each sketch, and choose a perspective that emphasises it.