How do I show the difference between a few tears and heavy crying?
For a few tears, use the standard sign with your index fingers moving down your cheeks once or twice. For heavy crying or bawling, you can use a '4' handshape (four fingers extended) on both hands moving down your cheeks to show a heavy flood of tears.
Do I actually need to touch my face when signing this?
You don't have to press hard, but your index fingers should lightly touch or hover very closely to your cheeks. This close proximity is important to visually establish that the tears are physically on your face, rather than falling through the air.
Can I use just one hand to sign 'tears'?
Yes, if you are specifically referring to a single tear falling, you can use just one index finger tracing down one cheek. However, for the general plural concept of 'tears' or the act of crying, using both hands simultaneously is the standard approach.