I agree with all the points raised in Rosa's answer but I want to add a few other points.
1. There are, in my opinion, slight spacing issues.
Everything looks a bit unbalanced. There is minimum spacing at the top of the illustration - the books and windows go right to the top, but there is a relatively big empty space at the floor. The logo, Google button and banner aren't aligned to anything, and look a bit messy.
A quick edit to address some of the spacing issues:
Note I have added some text above the Google Play button. This visually balances the whole bottom area against the larger banner on the left.
2. It wasn't instantly clear to me what this was about.
Having the illustration at the top means that is what you see first and you can't instantly see what is going on from the illustration. As soon as you see the word 'Go Ship' it makes sense, but you see that after the illustration. One option would be to put the logo etc at the top:
I'm not sure how visually important the different elements are but you can play around with scale and positioning to draw attention to the most important elements. Another quick edit to show some possibilities:
These are all just my humble opinions - based on first impressions and some very rushed quick edits so they may or may not help.