Just a quick render while trying to remember more of the basics since i have not used this program in a while. :-[
Nice light, but what happened to your clouds? They look like building blocks.
My clouds can withstand nuclear bombs they are made very dense one might say way too dense. :-\
Agree with Ulco that clouds need work, but a good start.
Echo. Looks a bit strange, but nevertheless interesting.
Echo the others but anyway nice light and composition :)