3:18a And we, who with unveiled faces all reflect the glory of the Lord,

Now we (incl.), whose unveiled/uncovered faces all reflect the Lord’s glory/splendor,
-or-
All of us reflect ⌊like a mirror⌋ the Lord ⌊God’s⌋ glory/radiance with faces that do not have the veil ⌊that causes dullness⌋.

3:18b are being transformed into His image with intensifying glory,

are being changed to become more like him in ever greater glory/splendor,
-or-
It is us whom God is making to be more and more like him in ever-increasing glory.
-or-
God is changing us to be more like him ⌊in our hearts/character⌋ in brighter and brighter glory.

3:18c which comes from the Lord, who is the Spirit.

⌊and⌋ this is the work of the Lord, who is experienced as the ⌊Holy⌋ Spirit.
-or-
The Lord ⌊God⌋ does this. He is described/identified as the ⌊Holy⌋ Spirit ⌊here⌋.

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