What do you think of this recent (unfinished) bathroom tiling work?
The work is shoddy.


Toilet should have been lifted and tiled under.
2 x 4's for molding.
Inset opening - no Bull nose tiles on the inset.
Bad molding.
poor fit.
Plenty of other things here .


Directly to your questions and concerns ..

In your contract you paid 2K up front. 
Look at your contract READ it. 

You should with hold 


The 2nd half of the payment $2700 upon completion. 


It says upon Completion. Hope you paid the first half with a Credit
   Card.


The job is not complete - it is not properly or satisfactorily performed.
Get Free advice from an Attorney or spend $200 to discuss it with an Attorney. $200 is cheaper than $2700 and a bad tile job. 


Disclaimer:

I am not an attorney and this does not constitute legal advice and is not a substitute for legal advice.

For those who decide to do this kind of selection of a contractor to perform work:


Get references, 
Talk to those references. 
View the results if possible (not pictures unless the references are providing them.
Pay with a Credit Card if you can as there is more recourse to get the issue resolved or your money back in the event you have an issue.