[Shooter]

Lookin good mate for a first attempt at composites, props nice, as Aaron says, shadow needs disruption and darkening a tad, also, the Spit is too low and gives the impression of a scale missmatch, look at the ground grass etc & its size in comparison to the Spit, if you lifted the Spit toward top of pic that would prolly compensate for it, alternatively leave spit where it is & drop the background so an area of sky/light appears inder the Spit, have the grassed area only occupying a quarter of the pic more or less, then sample top of your background and drag it up to fill the area that may be missing once youve lowered it, finally, a tip for everyone doing composites, lower the opacity of your subject aircraft by between 10 & 20%(depends on backgrounds content) this brings the backgrounds color and lighting through a tad and makes for a much better blend and can in some cases look Photo real when complete.

Hope this doesnt seem to full of critique mate, its not meant to be, just trying to help youur composition

Regards Shooter