Not bad
I see you've not submitted this one for voting, but I think it is pretty neat as it is. I do like your orange color use and the eyes on these characters are very cute and unique. I like the fact you have an orange under them going with your theme here of oranges. I think the white space is a bit unneeded but you can always add more background later to your work. I know you've done vector backgrounds before so it is nice to see when you do those. I think next time add a bit more and it will be a fully completed piece.
~~THINGS TO IMPROVE ON~~
More additions to this and less white space
~X~