It's going to be a great day!

 

 Very informal: It's gonna be a great day!  Why're you standing there?

Better English:  It's going to be a great day! Why are you standing there? (Same pronunciation as above, with a little more "are" in Why are you standing there?

Can you describe what's happening in the pictures?  Can you write about a great day?  If you want to have a great day, what are you going to do?