Shadow Art

I took this shot with a 1937 vintage Zeiss Super Ikonta when recently at the Tate Modern gallery in London. I think that the shot is OK as such but I want to try and experiment a little more with it (maybe a bromoil or saltprint, for example). I know that sometimes these processes need flatter images and I want to try experiment here. I put the shot up more to ask how should I try and tone down a little the blown out highlights. How much of a change or improvement could be made by split grade printing, for example? Really welcome your advice and critical comments.