Jfountain theme piece

So heres my theme piece! Considering my theme is Polychromatic expression of problems in todays world, i figured i woukd create a piece that centers around the fact that we are spending way too much money in searching for other planets and their habitats when we havent fully discovered our own planet. The only thing i need to add is a larger ship in the top right region and also all of my ink line work that is going over top of the ships. Does this piece have depth?  Should i add more ships or flyig space particles? Any other suggestions? Thanks!