I cannot see where the bar is against your shins, but from here those look like textbook deadlifts. You have a little rounding in your mid-back, but that does not fuss me much, especially in the absence of pain. Some people's spines are a little curvier than others. You don't appear to round very much at all once you are under a load. My advice would be to continue doing what you are doing and continuing to add weight. Go forth, my friend.