This is what came to my mind.

"estampa" refers to a small card with a religious scene in a Catholic context, often used as an aid to prayer (normally representing a saint or a martir)-- by extension, it refers to a simple scene in an illustration (and sometimes, by extension, to a simple scene).

In my view, the first "estampa" and the second one in the sentence have different meanings (as I mentioned, they are in a 'continuum', and this link has possibly been exploited by the writer)

I wouldnt take "milagrera" literally. It is possible that the writer is disparaging of religious cards, and people's belief that prayer will bring about certain outcomes.

While I may translate "estampa", on its own, as "prayer card" or "religious card" or "saint card", I have gone for "pocket prayer card" to undermine the seriousness of the card ever so slightly. "Miracle-granting Saints Card" seemed a little too much.

people pray to particular saints to ask for intercession or "miracles"

divinemercy.org/3.../st-faustinas-life-of-intercessory-prayer.html


St. Faustina said, “When I reflect on all this, I see that it was truly a miracle. Now I can see how much power intercessory prayer has before God”. (Diary 202) ...


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Note added at 1 hr (2012-05-13 22:34:20 GMT)
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http://www.catholicnewsagency.com/news/catholic_family_askin...

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Note added at 1 hr (2012-05-13 22:35:32 GMT)
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http://blessedmariannecope.org/prayer.html

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Note added at 1 hr (2012-05-13 22:39:38 GMT)
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I was looking for refs. so have just seen discussion entries. I certainly agree with Lorena about the holy cards or prayer cards and there are many people who truly believe in the power of such prayer to render miracles

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Note added at 13 hrs (2012-05-14 10:44:01 GMT)
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as Charles says, "prayer card" alone is probably enough but there are various kinds of these cards and these particular ones relate most probably to intercessory ones. In Ireland people call these prayers/prayer cards for INTENTIONS as they are hoping for some form of intercession from the saint/Virgin prayed to. So the "intention" could be that a child passes an exam, a person who is ill gets better, an emigrant is kept safe and so on. I think you are supposed to pray for someone else's intentions rather than being selfish (probably due to Luther's revolt against these and indulgences) although if you've lost something you can pray to St Abnthony for help finding it or for a lost cause to St Jude!!

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Note added at 13 hrs (2012-05-14 10:47:55 GMT)
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There are also prayer cards givingTHANKS for favours received

but St Anthony and St Jude are very popular I think!

http://www.luckymojo.com/saintanthony.html

http://www.stjudenovena.org/stjudeprayers.html

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Note added at 13 hrs (2012-05-14 10:50:14 GMT)
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In the above St Anthony link there is also the possibility of

PETITIONING as a synonym for Interceding