Depending on what your control flavor-wise is, anything is possible with anything. That said, here's how you veil with various standard elements;
Spirit: illusion images/invisibility, mentally withholding your presence / modifying the perception of others, manipulating light directly. (all senses possible - but effect is mental if not visual)
Air: manipulating light through lenses of air around yourself, silencing sounds, carrying away scents and other traces for other senses. (sight, smell, hearing, effect is physical)
Earth: manipulating light through magnetic/gravitic lenses, producing/altering your scent and other solid traces. (sight, smell, taste, magnetic, effect is physical)
Water: altering the coloration of your skin/hair/clothes like a chameleon, chemically removing scents and traces. (sight, but especially smell/taste, effect is physical)
Fire: manipulating/creating light, cooling down (thus obliterating) scents, heat and energy manipulation (sight, smell, broad-spectrum vision, effect is physical)
As you can see, it is far easier to veil vs all senses with Spirit - but against a mindless being or a machine, you'd be limited in your veiling.
Air is actually very good at sight/hearing based veiling, being able to physically alter sounds and images.
Water is more capable at veiling you from things with improved sense of smell/taste such as animals and a bazillion of nevernever creepy-crawlies.
Earth and Fire lack sound veiling but are best than all other elements in veiling you against machinery and long-range broad spectrum surveillance.