-- First thing.... I wouldn't use the sidewalk for taking pictures of my pens to sell on Etsy Blake. While it is a nice neutral color in natural light background, it's waaaay too easy to scratch finishes there! Pick up a bit of grit in a pen mechanism. Whatever...
This is not to mention the potential Etsy customers that are gonna say, "Ewwwww, it's been on the sidewalk! God knows how much doggy poo has been tracked over that!! The Germs, the Germs!!! OMG... It is absolutely beautiful, but I am NOT buying that pen."
Since you're out there in the middle of the desert and don't have grass in your yard like normal folks, you might try something simple like a classy looking binder for a backdrop, suede jacket, inside of a book cover.
-- As others have stated, avoid situations such as the joints in the sidewalk, they make your pictures too busy. The joints draw one's eye away from the object of the picture... your pen.
-- The closer you can get to the object and remain in focus, the more detail you'll get in your picture, and the more accurate your lighting will be. That being said, shooting your pen diagonally from corner to corner allows you get much closer to the pen, in turn allowing more detail to show in your picture. While Macro can be a bit fussy, you should have a tolerance of +/- an inch or two in depth of field (
range of focus). You'll simply have to play with the camera to see where that's at; see how much you can get away with turning your pens in the pictures up close.
-- The last thing that will bite you with picture taking of any nature is camera movement; get up close and personal, shooting macro shots, and any movement is magnified drastically. Try to stabilize your camera by anchoring a hand on the table, bench, sidewalk, appropriately situated body part, tree, post, whatever... Just make sure it isn't shaking or wobbling when the shutter clicks.
Your pictures do look good, don't get me wrong. Just pointing out things you might want to consider for future reference.
If you're going to rely on cell phone pictures, and not buy a camera, you might make camera quality a primary consideration in phone selection the next time you upgrade. I just recently upgraded mine to the
Kyocera 6810, has a 13 mp camera, takes awesome pictures, but they all look reddish to me. Easy enough to fix, either on the phone with it's photo editing software, or on the computer with photo editing software.
Personally, I use Photoshop Elements for photo editing, runs about $85, it has way more ability than anyone really needs. Ease of use for the average editing job is a matter of a few clicks. Then "Save for Web" to reduce image and file size.