What the file has to do

The first thing to check is the resolution, because that is where most low grade reproductions fail. A print sold as 300 dots per inch at the size on the label is the baseline you want. Anything below that will show its weakness when you stand close, and Amilcar de Castro's work gives you little room to hide it. His paintings rely on hard edges and flat planes, so a soft file reads as a mistake rather than a style. Ask the seller for the pixel dimensions of the source file and do the arithmetic yourself. A 40 by 50 centimetre print needs roughly 4700 by 5900 pixels to sit at 300 dots per inch. If the seller will not give you that number, treat the print as a guess and price it accordingly.

Colour is the second test, and it is harder to judge from a screen. De Castro worked in strong reds, blacks and whites, and those colours are exactly where cheap printing goes wrong. A bad reproduction will push the red toward orange or muddy the black toward grey. Ask whether the file was colour managed for the paper type, and whether the seller can show a crop at full resolution. If you are comparing two sellers, look at the same detail in both images, ideally a corner where a sharp edge meets a flat field. The one that keeps the edge clean at high zoom is the one worth buying. common subjects in his paintings can help you know which details matter most.

Paper, scale and what to skip

The material matters as much as the file, because a good file on bad paper still looks cheap. For de Castro's kind of work, a coated or semi matte paper usually holds the flat colour better than a heavily textured sheet, which can break up the surface you are trying to reproduce. Check whether the paper is acid free and whether the print is sold as a poster or as a canvas transfer. Canvas can suit a large piece in a room where you want a softer surface, but it also hides detail, so it is not always the right call for work that depends on precision. Summer, Canvas is one example of how a canvas edition reads differently from a flat print, and the difference is worth seeing before you commit.

Scale is where anxious buyers most often waste money. A print that looks fine at 30 by 40 centimetres can fall apart at 60 by 80 if the source file was not made for it. Measure the wall first and buy the largest size the file can support at 300 dots per inch, not the largest size the seller lists. If you want a framed poster rather than a raw sheet, ask whether the frame is sold separately or built in, because that changes the final size and the price in ways that are easy to miss. framed poster with a simple oak frame is the kind of question that usually surfaces at this point, and it is worth asking before you pay.

Where the risk actually sits

The real risk with a public domain artist like de Castro is not that the image is unavailable. It is that the same file gets resized, re saved and re printed by several sellers, and each step can soften it. A print that has passed through multiple hands may still look fine on a phone screen and fail on the wall. That is why the file check matters more than the brand on the label. If a seller cannot tell you where the file came from or at what size it was last rendered, assume it has been resized more than once. You can still buy it, but you should pay less for it.

There is also a difference between a reproduction and an original, and it is worth keeping the two apart. A print is a copy of a copy of a file. An original painting carries the artist's hand and a market of its own, and neither Auvrique nor any reproduction seller is the place to judge that market. If you are buying a print because you want the image on a wall, focus on sharpness, paper and size. If you are buying because you hope for something that will hold value like an original, a print is not that thing, and no amount of paper quality changes it. Marjorie Acker Phillips print is high quality raises a similar distinction for a different artist, and the same caution applies.