-Starfield and planet could use some work.
-I don't like the text and the text's...casing?
If you want to get into starfields and planets, you should check this guy out:
http://gallery.artofgregmartin.com/ , he was the one that started the fad. His work is amazing.
eg:
he used to have tutorials on how he makes his stars and planets, if you poke around - as well as a step by step of one of his star fields.