I find that the standard engrave option with a 340lpi does really well. I’ve done a handful of photo engraves, but always cool to see others doing it as well! If you’d like some tips, I did a post explaining my process.
Another tool I use is the app Snapseed on my phone. If you use “tonal contrast” is really boosts the details, and I’ll use the “details” tools to boost structure and sharpening. In my experience the glowforge will do a fine job of recreating whatever image you give it, so if it’s a soft image that’s what the results will show, but this also means that if it’s too overly sharpened it will reflect in the work.
Keep at it, I think what you’ve got here turnes ut really cool with her hair and all!