It depends on how you do art,
some artist actually using 3D model in their comic/arts, so if you're one of them, go get the best Processors and GPU you can get.
If you're one of people who also does animation, go get the best Processors you can get
if you're just into 2D art, then you can get mid range Processor and/or mid range GPU
oh, Gaming specs always good for art though, if you pick gaming laptop.. the screens usually not really good (color accuracy, view angle and something like that) but you can bet on performa.
Remember, try to get at least 8GB RAM or more also get the biggest HDD possible (SDD is optional).
if I were to choose, probably I would go with Dell XPS 15, the screen is so great and beautiful, the other option for me is Surface Pro or just build the PC myself (and lost the mobility).
in my opinion, for Artist, you should get the best IPS screen you can get with your budget because color accuracy is important.
Hope this help