It looks like you used that thing to defend against a bear attack. Glad you're ok.
IMO, daylight washes out the surface too much for this operation. I find a more direct/specific light source is better for revealing any flaws. I hang a single incandescent bulb above the bench(and sometimes shut the shop lights off too) and hold the bow under it... slow turning and moving it in critical positions as needed to inspect every inch using not the light, but the shadows produced by the light. That's the trick... using the shadow of a single light source at an oblique angle. The smallest flaw jumps right out atcha. Only takes a minute or two to check the entire bow.
I have a couple of palm sanders and quit using them a long time ago. I can do it better and faster by hand. Good tool selection/progression minimizes tool marks, backtracking, sanding, and any risks of affecting tiller or weight.
'Good enough' is very subjective. At this point if I saw a tool mark in one of my bows after it was finished, I'd sand it all back down to raw wood and redo it... or just burn it and start over. Arrgh... Tool marks drive me nuts.