Your spine appears to be close to neutral to me. The second looks a bit better. You could use a more exaggerated arch but some people find that uncomfortable. We would need to see a heavier lift at least 70-80 % to see what is going wrong a bit more.
I am not sure what to say about the bar striking the knee . I focus on moving the bar and into me. I use more of a clean deadlift as my proportion are different to yours.
I think you doing ok , using the lats and keeping it close , fairly neutral spine not a bad starting position .
I am sure some better technicians and deadlifters will also respond.