I appreciate the hard work. I like the feel of this character as well as the style. It is a strong contender, but we would like to see some other types. Perhaps you could try a different animal (something less common) or something imaginary.
I like the action in #41, jumping over the word Eureka. I think you could take away the glasses and maybe even the ears. I think a rounder face would be more friendly. I would also like to see some gradient shading.
I am still partial to the stance of #59, but I feel like the proportions are off. The head seems too big for the body. For the lettering, I would like to add a border to the letters. If you can think of any other suitable ways to accent the letters I am still open to ideas. I have mixed feelings about the quotation bubble, I will get back to you about it later today. Until then, know that our general color scheme uses green and yellow (we're open to gold or orange accents as well). Thanks for all you hard work. I look forward to seeing what you come up with.