The ideal crush depends your system and process. When I batch sparged and used a bazooka screen or braid, .037" worked well for me. When I used a brew bag, .025", and now, with the Digamash (all in one), I found .042" gives me a happy medium between efficiency and good flow for recirculation. Most of the more popular 2 roller mills will produce similar results with the same gaps, so using these gaps as starting points should produce reasonable results. Like anything else in your process, if you're not satisfied with the results, adjust a little at a time until you find your sweet spot.
Hard to tell from the pic, but the crush looks reasonable. I like to see a little bit of flour though. You might try a batch at your current gap and go from there.