Looks good but I think it could do with a bit of a tidy up and a few more taxiways at the bottom and on the right, pushbacks across a runway are not advised.
It's really difficult for me to make start-up locations that work with the jetways - not too far, not too close, and are also good for aircraft of various sizes.
I guess there's a "sweet spot" - a constant distance & heading from the jetway's location. But I have not found it yet.
The centre point of AI aircraft is across the main gear so the offset for parking would depend on the size of the parking bay, large aircraft stop further from the gate than small aircraft, so you would place the parking position according to it's radius. If in doubt set it a little further away from the gate, a short parked aircraft will look better than one with it's nose in the terminal.
Green circle marks the approximate parking position for aircraft of that size.