Gonna need some info, what medium ur growing in? nutrients? is the space outdoor or greenhouse? and really any other info u may think relevant that could help diagnose and welcome to the community, hope we can help.
Welcome to the community @Cecilia. We’re going to need some info so we can help you.
The first thing I notice is that you are greatly lacking in light. Secondly, I don’t like the way that soil looks. Seems a bit heavy to me and very wet. Are there drain holes at the bottom of your buckets? Next time, buy some Fox Farm Ocean Forest so you can see how good soil looks and feels. Also, check out this article to understand what is in a good soil mix. https://www.royalqueenseeds.com/blog-create-your-own-soil-mix-for-cannabis-n75. I am using this recipe for my outside grow this year and can’t wait to see how well it works. Good luck. You can also check out @canagen grow logs. He has given advice and recipies for soil mixes.
Hi @Cecilia, welcome to the community, hope you get on top of your issues, I’m only a beginner myself but all the guys here are great with knowledge on the stuff you need to know about growing, well happy growing 
Your soil don’t look good at all i don’t see any perlite in there and it looks like the soil is compacted down and poor drainage likely got root problems not sure if there’s holes in the bottom of your pots