As this is a gouache painting, it will need to be framed behind glass. I recommend custom framing but it would fit in a standard A1 frame with A2 mat opening (or you could have mat board custom cut to fit)
Painting will be carefully packaged in a cello envelope with backing board and protected with sturdy packaging to protect it in transit.
Painting will be shipped Australia Post with a tracking number and will require a signature on delivery.
1st image shows complete painted area.
2nd image shows example of what the painting might look like framed.