I think it looks great! You are very brave - I have often wanted to make a block design very large but didn't really know how to go about it without hours of trial and error...what's your secret?
You should try it. Its fun! I love the coloring part. You can get an idea of what its going to look like. Oh and BTW, thanks for saying I was very brave! Such a lovely compliment!
.....and here's the finished block. I think it turned out really nice....now for some borders...