Very interesting concepts.
#14 & 15, I like the opposing positions of Bull and Bear, since it symbolizes their concepts. I would suggest more contrasting in colors to make it easier to identify shapes. I am selling old stock certificates, and would like to have a classic feel to logo; is there an easy to read classic font that could give it a feel as if from early 1900s?
#16 Very creative & interesting, I never thought of this concept. I need a little time to think about this one!
Thank you for your work.