Cool, looking forward to this. Just a general observation (I have done some logos, Ardor for example is my original idea) keep it simple graphic-wise. Coinmarketcap symbols are 16x16 pixels in size and it has to work on thas size too.
Also, there is a distinct difference between a plain good logo and on the other hand nice graphics with cool background images, and this is about a logo.
I would suggest some guidelines how to present the proposals so that they are easily comparable between each other, like maybe a png format with transparent background, 16x16 pix and 300x300 pix sizes, for example. If all proposals are equal that way it is easier to judge the actual graphic quality of the designs.