I agree with what has been said, that front piece where the tractor hooks up should be vertical and not leaning so much. The rear tire is WAY to high, it needs to be lowered. I cant imagine that thing wouldnt be scalping the ground all the time set up like that.
The flat bar (running from the top of the 3 point hitch to the back of the mower will need to be longer to set that 3ph vertical, you could also use a piece of chain instead which will also let the back of that mower pivot up with the ground if needed, but still support the mower when raised.