You can become an admin by showing good commitment and displaying a good example to other users, through behaviour and quality of work. For a start, to become an admin you have to assist with the animal pages to a high standard or assist with image work, which is a huge commitment.
I think you could send your ideas to email@example.com because Garden has already been released, and there's only 3 animal slots remaining. If you want though you could replace snail with flea, or you could come up with a more suitable behaviour for snails.
Hello. Rodeo Stampedia looks good and I've added it to the approved spotlight list for March. The image you had requested: this one is fairly good, except that the spotlights are a horizontal rectangle, so it will get cut off top and bottom. I think that will look a bit odd. It's also better not to have words if possible. Do you have another you like that would be a horizontal rectangle instead?
Horse (like the one the player starts on at the very beginning)
That’s all I can think of. There’s only so much you can do with a farm because most of the other zones have taken possible farm animals.
Also, I think your abilities for animals should be varied a bit, because your cows are pretty much identical to sheep, your donkeys are pretty much identical to giraffes and your turkeys are pretty much identical to emus. Like with Islands, I think you should attempt to come up with some new, refreshing behaviours.
Also, when making a blog for the Sinnoh region, just keep in mind that Sinnoh is the fourth region of Pokémon, featured in Diamond, Pearl and Platinum. You have to include Sinnoh Pokémon or at least Pokémon from those games, not others.