Been building bird-scale gliders for a few years now and the paint job is where most people trip up, so here's what worked for me after ruining two fuselages early on. Regular spray paint eats right into foam, so you either need a water-based acrylic or a proper barrier coat first. I brush on a couple of thin coats of watered-down white glue as a sealer, let it dry overnight, then the paint goes on smooth and nothing melts. For a camo pattern on something like a buzzard, skip the tape. Tape pulls the foam's skin off when you peel it. I just tear up some paper towel scraps, lay them loosely on the wing, and mist around them with brown from a rattle can held far back. Soft edges look way more natural than hard lines anyway, and real birds aren't exactly crisp.
If you're adding feathers to the tips or tail, keep them light. I glued mine on with foam-safe CA and kept everything near the outer third of the wing so they act like winglets. Check your balance point before the maiden, it'll sit further back than you expect with all that trailing edge. Two short hops over grass first, not a full launch, in case the trim is off.