Render7

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Rendered in Cycles, 400 samples. Little compositing in Photoshop.

The materials in general look extremely convincing, especially the leaves.

Good execution overall of what is otherwise a very simple concept, there are times when simple ideas like these make the best images.

Very nice work… The leaves are very convincing.

The cog could probably do with a few sharper edges though, looks slightly smooth for worn, rusted metal

Looks good. I would consider displacements on the wood for a close up shot like that. The texture looks very flat where the bump mapping doesn’t catch the light. Also, the aged metal looks perhaps a bit too bumpy for the relatively low roughness of the gloss shader.

Nice work! I like the use of color and texture to sell the image.