Quick update on My babies and advice

Hey everyone!

I just hit Day 15 Flower and they are looking pretty good for my first grow. Although I think they look pretty small compared to what I’ve seen for this stage. What do you guys think? I did break the top two Colas on the White Widow early on also 🥺🥺

I am growing in a small space 2x2x4 with a small Mars hydro 600. Could just be because of space and lighting.