I actually think corydoras would be awesome here since i love the natural look of the gravel. So I would leave the front of the tank unplanted but maybe a few sprigs of dwarf sag and maybe use anubias on the wood near the base. I think some taller sag for midground. Background maybe some stems behind the wood but nothing on the sides since the stems won't look attractive from teh front when not hidden. They will get raggy over time and kinda ugly.
yep the foreground grass is competing with the driftwood for the eye, i'd also move it back behind or to the side of the wood, or both, and put shorter plants up front, maybe stemmed, that stay shorter than the arch/curve of the wood reaching out to the left.