I think they seem fine. There's a small amount of the knees coming forward at the bottom, and thinking about keeping the knees out at the bottom should fix that right up.
On another note, it looks as if the bar is really close to the metal thing jutting upwards out of the rack near the safety pins. It couldn't hurt walking the bar out a tad bit closer to the rack in case you fail; you want the bar going on the pins and not hitting that metal thing.