Like bk_t1, when I'm travelling on business, I really don't care that much about the pictures. I want the room to be tasteful and clean, but mainly I want it to be comfortable with a nice bed and functional work area. I don't spend a lot of time in the room on a business trip; it's mainly a place to crash at the end of what is normally a long and tiring day, sometimes made worse by jetlag. Give me a good quality mattress and bedding over nice pictures on the wall! Artwork is not going to get me to stay there. Just make sure the rooms are not ugly and decorated in 1980s decor.
Now, when I'm travelling on vacation, then I'm looking for more of a luxury stay, and I expect nicer decor. On vacation, I do expect a nicer room, and that includes the artwork. Artwork won't be a factor in my decision to stay there, but I do expect something nice.
But hotels don't have to be both.
I choose different hotels for my personal trips vs. business trips. On business, I have a budget and can't pay for luxury properties and upgraded rooms. On vacation, I spend a more; a lot more. On business, I like being located near the airport or in a business district near to my meetings and maybe a couple of good restaurants with predictable food that I'm used to at home--simple, convenient, comfortable and practical. On vacation, I'm generally seeking the opposite.
Edited: 9:29 pm, November 15, 2012