In your example, the moments all look within reasonable proportion. For stability, one would want the CG to start @ the .25 (25%)point. Your wing is a rectangular planform with no sweep. So the ideal starting point is simply 75 units (mm or cm) back from the LE at the wing/body joint. It can go as far back as 33% or 99 units, but the farther back the CG is, the less stable the plane will fly. These basics are intended to give you a positive pitching (hence positive stavility). For a new flyier, this will have the best chance of a successful first flight, assuming good straight construction, which your pix looked good.

Good luck and I hope this is helpful.

RCS