Some of your photos are truly amazing. And from my experience some of them may be relevant to magazine market. Have you ever thought about that? In most cases it’s not about sending photos that your friends like, I would say in most cases magazines have really strange requirements. There are quite a few really good books and websites out there if you go looking. My suggestion is to check one of them – http://www.freelance-market.net
– and try a couple magazines until you find out what does the job right for you. And certainly don't be despondent when your images are rejected or not used. After all it’s fun.