Here's a small melody which is an exercise to find out the scale and key used.
If I've learned my lessons well, the key is A Maj . This is in fact the A Maj scale arranged in a way to accentuate the A Maj chord (in fact it never leaves that chord).
Obviously, as there are all the A Maj scale notes, we can build all the chords (triads, at least) but, as I say earlier, it seems the I chord is the one emphasized.
Assuming my thoughts are correct, my question is: how should I interpret the function of the non-chord tones (all except the A, C#, E)? Are they what is called passing tones?
Didn't noticed the image was missing. My appologies.

Thanks