Trying to be constructive for the most part I think it is pretty good.
1) Is the title Emeraldking or Emeraldking Aquatics. The dash location makes it unclear could be read EmeraldKing - Aquatics <and> Livebearers, but I think you want EmeraldKing Aquatics - Livebearers. Might even want to consider Emerald King Aquatics, sounds quite good. Possibly could ditch the Livebearers in the title given that it is clearly defined on the line below. In any case I think Aquatics should have a capital.
2) Perhaps change the second tag line to something like "Visit the Magical World of Livebearers", next line "at", last line the web address. More of an active tone. The "at" line may not be necessary because it is implied by the web address below.
3) I spent time trying to figure out the lion. It appears to have four eyes kind of like perhaps bird eyes or fish eyes, maybe they are ears if so they are too low, anyways it is not clear. Knowing you are a leo kind makes it make sense, except the extra eyes, but you don't want to explain that to everyone that gets your card. If the lion is important then I would start with a different lion head. Remembering that details will be difficult to make out when printed card size.
4) The Gold, Emerald, and Blue colors work well together and do provide a regal tone to the card. The subtle graphics in blue take a boring expanse and provide visual interest without distracting from the message on the card.
5) Breeder of rare livebearers is great because it describes the niche in the market you are best at. Clear, concise, and descriptive.
Just some thoughts, you are welcome to tell me where to take or put my suggestions. I doubt most people would even notice what I mentioned.
