This is one that I have discussed with colleagues and clients alike.
I am a woodworker. I have worked with wood all my life, I have built pieces of furniture, as well as my entire workshop. My father was a carpenter as was my grandfather. This is what I do for a hobby, and I am far from a master.
With my pens. Many of my clients call me an artist, but I deny it and claim myself an artisan. I am highly skilled in what I do, and I am able to take many different materials and figure out how to put them together to create a beautiful, functional pen.
While others are capable of taking those same materials and assembling them, not only into a functional pen, but something that evokes a theme or an idea. Some of the original steampunk pens, we saw around here, are examples. Parts were added that were not needed for functionality, but that were used to create an image in the viewers mind. When you looked at them, you immediately think of the creations by the earlier industrial era inventors.
Segmenting is another area where some "artists" go beyond putting a couple of pieces of wood together to make a simple pattern and create a piece that evokes feelings beyond the materials. Similar to an artist putting paint/ink to paper. The Gisi collection is one I look to in the early days of this in pen making. My herringbone pen is me starting down this road, but I have a long way to go before I call my self an artist.
Another aspect is when guys "hand" carve, etch or paint designs into their work to create and image or a theme. Here I look to Tim Cullen and his recent "Shawshank" pen, that was not only made with wood related to the event, but the clip was hand engraved with images he created to represent the event, (a prisoner crawling through a tunnel). The perfect fit and finish of the pen itself is the work of a master Artisan, but the addition of the clip takes it way into the area of the artist.
Just my two cents.
This group is filled with many talented people and I love coming back here every morning.