I can't say much about pricing, as I have no idea what sculptures would go for. Your tags seem OK to me - at least, the items I looked at seem fine.
You might want to try adding 'barbed wire' to some items and see if that helps with views - that's what I'd call that wire, but I'm British, and not your target audience. :D
Also, try mixing up your titles a bit to see if that helps with views. The first few words are the most important - so think about what your customers would be searching for. Would they be searching for 'Recycled Rustic Barbwire Trees Country Christmas Trees Made From Rustic Barbwire (Conifer Style)', or 'Wire tree sculpture', 'Metal Christmas Tree', Recycled Tree Ornament' (I have no clue, just thinking out loud).
Oh, and I *love* this tree.
http://www.etsy.com/listing/115191871/recycled-rustic-barbwire-trees-country