Whilst my Flower painting website is offline, I have recently engaged in some discussion with young designers about website design for professional artists.
Interestingly, the newer, younger professional artists in their 20's tend to renew a website design every two years, some every year.
The mid-life professional artists, in their 30's - 50's, tend to keep the same website design for 3-5 years.
The senior older professional artists, in their 60's - 70's plus, tend to keep the same website design for 5 years or even longer.
It used to be that an artist was out of step if their CV or recent work was not updated on their site. In more recent years some designers have concluded from analytics that visitors to a site may notice the actual design first, and register an opinion about an artist by how long the site has been there in its current design state.
If an artist's website is more than four years old (considered by some to be past its sell by date) visitors tend to go straight to the blog posts and news, tending to by pass the images of the artists work.
Different designers have different means of accumulating data, and this information has to perhaps be taken with a pinch of salt. However, having asked my Collectors to answer a questionnaire, I can see that regular renewal of a website design does invoke a more positive impression of both the artwork and the artist.