1st composite WIP: I'm a bit stuck

Hi, I'm working on my first ever composite and indeed edit not made by my usual method of taking a perfectly good screenshot and throwing lots of filters, paint and noise at it.
It's not very adventurous I know but here it is - still a WIP.
I've stuffed up the prop and need to work through a decent tute, and I plan to put some mud on the gear. It's misty but some gentle highlights on the plane and a faint shadow might be in order.

Here's a bit more work done, can't get the prop any better, blended the plane a bit more, muddied it up a little.

What do you think? Anything else I should do? I've tried blending the plane in more (and the sheep
It's not very adventurous I know but here it is - still a WIP.
I've stuffed up the prop and need to work through a decent tute, and I plan to put some mud on the gear. It's misty but some gentle highlights on the plane and a faint shadow might be in order.

Here's a bit more work done, can't get the prop any better, blended the plane a bit more, muddied it up a little.

What do you think? Anything else I should do? I've tried blending the plane in more (and the sheep