Squats, chin up. Looking like you're lacking confidence, but having your head down will make you lean forwards and bend your spine. Straight ahead or look SLIGHTLY up to encourage a more neutral position.
Bench, have your grip a bit wider, looks pretty close grip which is working the triceps more. You want your pinkies on the ringlets (part of the bar that isn't knurling/grippy bit) or an inch inside of this. When you're pressing, think that you're squeezing your elbows towards each other, contracting your pecs in the process.