I think this is a difficult area. The statement can (and hopefully, will) "set the stage" for the "experiencer" of the work.
I've read quite a few ... the least desirable, in my humble opinion, are the ones where the artist tries to "pump themselves up", and overdoes- translation: pretentious to the point of being bizarre.
I would suggest: Keep is short, and keep it simple. A bit of mystery might help, and the first principle of poetry - say, or imply, a lot with the fewest possible number of words, can be very effective.
The "shortness" is important. If we try to imagine ourselves in place of the visitor to the gallery, just after they receive the brochure: Open the book, glance at the names, and possibly read the first or second line of the Artist's Statement. Very few will read an extensive volume advertising the *wonderful* achievements of the artist - the unconscious mechanism here is "Oh, yeh? Let me see the work, and I'll decide." Not too good a "preconditioning" for your work.
This is the last statement I wrote:
Ed Sukach - "Born in Beverly, MA, 20 July 1934 - Incurably awestruck and mesmerized by the beauty of the world ever since."