Not offence but you should word it better, do you know how rude your comments sounds.
For starters, they already said that Mobage Cards aren't allowed to be uploaded on the Wikia due to the sheer amount of the cards. And you uploaded it because you wanted someone to render it? Sure maybe you may feel like it's a good picture for the page, that's acceptable, but you could've word it differently like asking for a change in profile picture and their thoughts if they agree or not. But you didn't, you just straight ahead and go
Can someone make a render of this image?
You didn't even mention properly for what purpose nor did you express any intention for discussion. You could've write it this way.
Can someone make a render of this image? I feel that it'll be a good replacement for the current profile picture? Thoughts
Rather than just saying your demand and expect it to be done. I believe none of the admins here are so close-minded to not accept your ideas but you also have to express it accurately.
But you should still apologize for the "Sure, whatever" reply because even if you don't care anymore, the way you worded it is rude, they didn't purposely offend you so you shouldn't behave the way you did.