We don’t pray to holy cards or statues though. That would be disgusting idolatry. We look at the image bc it reminds us of a saint or Christ, like you would look at a pic of your mom. I don’t think you worship a picture of her. Yes, we do talk to the saints, and yes, you could call that prayer, (Prayer isn’t strictly worship) asking them to intercede for us and join us in asking God in our petitions. If you have a loved one you believe to be in heaven, and if you’re having a problem, would it not be ok to ask your loved one for a favor in addition to asking God? Let’s say my father is passed. In addition to my prayers to God Himself, I might ask my dad to pray for me, too. People in heaven are saints, and they’re our friends. They’ve passed the test and want o help us, more than anything, to get to heaven. And to be clear, God and God alone is to be worshipped, called Latria. We give reverence to Mary, not worship. This is called hyperdulia; and to the saints the reverence given is dulia. Only God is to be worshipped and this is solid Church teaching. I hope this helps.