The concept of "horse" and "overboard" must be clearly conveyed. ("Overboard" means "having jumped or fallen off of a ship or boat"). Maybe the horse is suspended above the water, mid-leap, or maybe it has broken the surface of the water. I like the forms of the horses depicted in the sample images of "diving horses" which I have uploaded. (I do NOT want a rider on my horse, however!). Perhaps the horse is shown in silhouette. Also, I like the idea of the horse wearing a racing "silk" with the number "1" on it. This is not mandatory - just an idea, and it may not work visually. The "water" I have in mind is the ocean or at least a large body or water.
The logo should be clean and elegant. It should be workable as an avatar as well as a general logo for the blog. I like "flat" designs, but I am open to a design with some depth/texture. Overall, I think I prefer designs with more of a "retro" or classic feel to designs that are too "contemporary" or trendy
Some designers have expressed some difficulty with the concept above, so in addition to the "jumping/leaping horse" idea, I will be open to other concepts - but whatever your concept, again, your design must clearly convey "horse" + "overboard" For example, an alternate solution could show a partial horse IN the water. An element such as a life preserver could be used to suggest "overboard". I'm sure there are other possibilities that I have not considered.