Photography is a difficult field to get into right now while maintaining any sort of reasonable income stream. Ultimately, it's less about what you can shoot than how you can market yourself.
I liked some of your shots, disliked some others, but the main issue when you'll be making a portfolio (instead of a general flickr account) will be showing off your unique style within the field that your clients are interested in. That's one reason a lot of photographers I know have multiple portfolios. For example, you'd want a different one for your product/food photography than for portraiture.
If you take it seriously and you get lucky, most likely, you'll be able to make a living at it. I suggest reading over this extensively :
http://www.asmp.org/strictlybusiness/