Use android phone with broken screen as WiFi camera
Are you sure that the camera isn't damaged as well?  IP Webcam has settings for resolution and quality, but I don't see anything indicating that it's tied to the screen of the device.

Actually, I'm not sure we're using the same cam app.  Maybe it would help to try a different one.  I used 'IP Webcam' because I was using mine for video.  I'm sure there are good options for still shots.

You can also try using something like TinyCam Monitor (free) to view the stream if you're viewing live video.  It makes for an easy security camera system.