Calling fellow Mayans for assistance.

I am Modelling for the first time, so forgive my lack of knowledge and terminology.

I am lowpolygon modelling a car for a friends hobby game. The plan is to start modelling using polygons then convert to subdivs for added smoothness, while keeping the total polycount quite low.

Polygon Model
So far I'm "done" with the basic shape and ready to convert to subdivs.




Converted to Subdivs
The problem is that I get too much roundness around the windows while I want that roundness for the wheelhouses.




How do I counter this effect on the side windows? They remind me more of boat windows now
And what is the problematic called so I can search for more information on the net.

Would splitting up the model in layers help? I mean put the roof and wheelhouses on separate layers and then convert them to subdiv's separately?

Any suggestions welcome. Have a nice day.