Damn man, that is one sweet Garage Gym setup!
Squats are pretty borderline on depth so get an extra inch lower to be sure. Knees could be shoved out harder.
Press - pay more attention to the unracking process. Its allowing your wrists to bend back too much as the set goes on. Get your feet directly under the bar, unrack with neutral wrists and vertical forearms. Squeeze the bar tight and keep your armpits squeezed tight. Feel free to wear the belt if you like. Also you only need to step back one step after unracking, no need to walk it back that far.
Bench - you are tucking your elbows in towards your sides a bit too much. Forearms should be perpendicular to the ground when viewed from the front.
Deadlift - You are dropping your hips a little when you get your squeeze causing you to be on your heels a bit. Keep them up. It looks like you are looking straight forward. Pick a spot 10-12 feet in front of you and keep your eyes there. Also a 3in belt may be better for you for Deadlift