how to Views call images of each node? I saw that is not in SQL of the view I have a View that shows the first image of each node (so, a common View). I saw the SQL of this view, and I saw that the image is not called inside this SQL, so, what's the way that Views call images of each node?
It sounds like your view is configured to show nodes instead of fields.

When a view is showing nodes (either as teaser or full), the view only uses SQL to get which nodes to show. Then it calls node_load() and node_view() before outputting. node_view() will output a node just like you were looking at it regularly and this is where the image is being pulled in, not in views itself (hence why there is no SQL to get the image).

When a view is showing fields, it grabs all the fields data using SQL instead of node_load() and displays that data using it's own templates instead of node_view().

Let me know if I can clarify further.