Just my personal opinion: I'd like to see more brightness in #2, a lot more contrast...they're all a little dark to me but tattoos look amazing in a higher contrast. Also, I would've hung a black sheet behind him, I can't stand the chair and curtain...they distract from the subject. Maybe if it was just the chair, I could like it. In the first, I think I would have angled in a way where the diaper doesn't show or taken it off. For me, diapers are very unattractive to show, but I like the position and the baby's face. In 3, I just would like a different expression for baby. In 4, I would've done a plain black sheet behind, it's a little distracting to me and I would've liked a different lighting angle; it's a little harsh for a baby. I also love the moodiness...but if 1 didn't have the diaper, I'd be head over heels for that shot! So cute!