The background works exceptionally well here--almost like a setup with some lights behind them and a hair light. Overall the lighting and feel is just perfect. I think the centered composition weakens it slightly here as maybe does the inclusion of the platform (a little distracting). You might consider a crop at the bottom; then look and play with taking them somewhat offcenter, if anything works to improve on this already fine photo (I can't see it here though without cropping in too much).
Very nice candid work! |