Nice! The execution of this is amazing! The cgi is breathtaking, i love how you can see the shadows behind the Da. I like the way you interpreted the original logos letters. I know im not a digital artist, but i love it! I dont think there is anything you could do to improve it apart from maybe adding some different colours, but to be fair it looks good with the vibrant greenthat you have used ( which in my opinion matches the original logo fantastically) I really dont know what else to say apart from keep up you perfect work, I cannot wait to see more!
I'd recommend the CC-by-sa license though, because nd prohibits changing the size and format (to png for example) as well. And there's no need to exclude commercial use – or do you fear that others can make huge profits from it when they have to disclose the fact, that the icon is free CC-content?