If it takes someone 5 clicks to see an artwork, you've probbaly lost a customer.
I've sold more than 1,000 artworks online over the past eight years.
My one recommendation: get to the art faster
A lot of the dealers, artists and galleries I speak to, their websites takes 3-5 clicks before you see your first artwork, e.g.
Home > Artists > Individual Artist > Artwork
or
Home > Collections > Contemporary Art > Landscapes > Artwork
Think of your website like walking into a gallery. First time customers come to browse and see what catches their eye.
They don't necessary know what they are looking for.
The more decisions / work you make them do, they more likely they are to leave your website and never come back.
Your homepage is the most valuable space on your website. Use it to show your art.
I think of my homepage like Instagram - the goal is to get visitors scrolling and eventually they will find something that catches their eye, and then go deeper.