Design for screen - Login Page

My first initial idea was to create illustrated and colourful app but when it came to designing illustrations for the login page I have found it very difficult. During my previous research I get some new ideas for the designs to use the photography instead of illustration. I wasn't quite sure it is good idea mainly because I used the photography for the GIF which is opening the app and I didn't want to repeat my self, but while designing it I was ending up with quite good designs. Here is what I have come up with:

 

 

 


The second page would be for the users to sign up. I want to stick with the idea of photographs in the background.