I see potential in these images, but I don't think you're quite there yet. I'd suggest going back to do a reshoot fairly early in the morning, preferably with a clear sky, the overcast in the images has resulted in a very even, boring light. If you have a polarizing filter, use that. The big issue though is the focus/DoF. There's too darn much of it. With all the trees in the upper image, you have a perfect background for a shallow DoF, selective focus image. As is, with everything focused, there's little to make the truck stand out, especially since it's very similar in colour to the background.
Just my $00.02 worth - your milage may vary.
~John
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