Gaaaah!!! My eyes!!!!
Your form is 'orrible.
First off. Whydafuq are you deadlifting in squat shoes? The raised heel pushes you forward when the bar is on the floor, adding to your bad posture. Shoulders should be over the bar, unless you are Gimli the Dwarf. And even then they should be over the bar.
They also add whatever height you have under your heel to the entire lift, so you are having to lift the bar an extra few cm. But worst of all, they pitch you forward. Take the shoes off and lift in sock or a flat sole shoe like Chuck Taylors or wrestling shoes or, best of all, Metal deadlfit shoes. $$$$ but worth it.
Your lower back is curved like it's about to snap, which it will eventually. All dem discs between your vertebrae squishing and squeezing just waiting to burst or pop out of place or pinch a nerve. If you keep going like that you will be having to slide out of bed on your belly to crawl to the toilet to pee. I kid you not.
Get your arse down way much more (like wot Brick said). Low enough so that you can get a proper arch to your lower back. Concave, not convex as you are doing. That will also, once you ditch the shoes, help you get your shoulders over the bar and let you use your legs to break from the floor. At the moment its all back. Mostly lower back too. Ahem. Your legs are almost unused as can be seen by that "almost hitching" move 3/4 of the way through the lift. Your legs should be locked, or almost so, by that stage. Do that in a comp and you will more likely to be red lighted for hitching.
Keep your head up, as you are doing, but get the back arched and LOCKED first.
Why are you doing them so slow? Deadlift should be explosive, like an Olympic lift. Do them slow, if you have a reason for it (insert gaycrossfitmovement here) but under normal conditions you should be blasting off the floor.
So, get the weight off your toes which will get the weight on your heels which will help you use your legs and keep your back straight.
I gotta go have a lie down now. I'm all abother.