Radio frequency skin tightening after liposuction of arms effective and when to start? (photo)

I am 3.5 post op for Vaser liposuction of the arms. I am pretty happy with my results this far (attached picture is before and after) but wonder if skin doesn't tighten to my satisfaction if skin tightening with Velashape or something similar would be effective at all. When would you recommend I consider doing so if at all? Thank you so much!