The only thing i'd say here is to work some hamstring/hip flexibility into your routine. The tuck you show at the bottom position may (or may not) hurt you in the future. I've had more luck with weighted stretches such as light Seated Good Mornings, then I have had with traditional stretching exercises.
Personally i'd prefer to speed the reps up a little as well, but that's a very debatable issue and not something i'd recommend to everyone.
Apart from that, all good.