Steve, as my education regarding fine doubles has evolved over the last 20 years, I have definitely arrived at a place where engraving is last on my list. While I have some amazing examples of it, to my eyes, some of the very most beautiful guns made have no or little engraving. It's about the lines of the gun.....the visual balance.
That Belgian gun of yours looks pretty great just like that. The gun that opened my eyes to how beautiful guns could be was a CS Rosson in the Double Gun Journal about 25-30 years ago. I could not believe the lines on that gun.....16 gauge IIRC. No or little engraving.
To each their own but to my eyes, nothing looks better than a small bore Fox SW with 28" or 30" barrels and a fine piece of walnut. While often the action and some of the furniture needs a little touch up to smooth out the rough edges the factory didn't bother with (and the roll stamped "Sterlingworth" removed), once done.....the gun is gorgeous. Every time I look at a graded Fox I just think......."would be so much better without the engraving".