Artistry is a branch of crafting that focus on getting more out of you item through talent rather than technical know how. If you wish to gain further levels into Artistry you will need the appropriate techs. Below is a description of Artistry from thad and the tech requirements for the levels.
Artistry is born from within, brought to bear by your own inspiration and
creativity. In certain ways, it is similar to Expertise, requiring
persistent crafting and the exploration of new ideas to bring forward
your creative force.
Just before you craft an item, you may choose to focus your study on
Artistry instead of Expertise. If you do so, any Tech that you might
gain from crafting that item will be allocated as an Artistry Tech
instead of defaulting to Expertise. Note that gaining any Tech prevents
all further Tech gain in either category for 18 hours.
This choice of focus allows you to advance in Expertise and Artistry
separately, distributing your attention as you wish. Wise selection can
be significant in your progress! Focusing on Artistry when you have
already learned all that you can from a craft with regards to Artistry
can "waste" a potential Tech if there had been something to learn in
Expertise, and vice versa.
You may see a list of the Techs you have acquired with the 'quests
action, crafting' command. Likewise, any Artistry levels that you gain
will be permanently recorded in your quest log and can be viewed with
the 'quests completed, crafting' command. Each successive level of
Artistry requires a certain number of Techs, as follows (note that
Artistry Techs and Expertise Techs are not interchangeable):
[ Artistry level ] > Artistry Techs required
[ 1 ] > 0 [ 5 ] > 36 [ 9 ] > 90
[ 2 ] > 6 [ 6 ] > 54 [ 10 ] > 99
[ 3 ] > 18 [ 7 ] > 63 [ 11 ] > 108
[ 4 ] > 27 [ 8 ] > 72 [ 12 ] > 12Source : Odinn