Category 1 - Aircraft types: WWII aircraft (Can be taken anytime)
Mustang climb by LightningGoose, on Flickr
Category 2 - Close up: A close-up with aircrew or groundcrew as the main focus.
Adding soon...
Category 3 - Action: Aircraft using reheat (Can be taken anytime)
Burners by LightningGoose, on Flickr
Category 4 - Weather: Snow
Adding soon...
Category 5 - Editing technique: Colour popping:
RAF Cosford Museum 097 by LightningTheGoose, on Flickr