No, the pronunciation isn't correct here.

It is just fluent psa

Pies is the basic, Nominative form. "psa" is Accusative, which is probably the most widely used case. "widzieć" (to see) takes Accusative.

If you need more information about the cases, I'd recommend checking this topic for posts about cases.

I have never encountered "piesem" before. Maybe you meant "psem"? That would be singular instrumental.

That works.