Hey Jamie

Its getting there for sure. The ocean is probably to repetative right now and a little too bumpy (IMO)

Also in regards to the HDR, add a spotlight or directional as well to pick out some nice form on the edges of those aircraft, look at the upper edge of the clouds, theres a bit of sun coming just in.

Beware of the lighting when using hdr, people fall into the gimmick or easy trap of hdr, MR etc because its 'cool' and their images always look like a blue ambient dull day and the image is ruined.

Cheers
Jay