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Hi Stanka
I'm sure you'll get responses recommending you don't do what you propose. Personally, I don't think there's anything especially the matter with it except perhaps that you will be adding quite a bit of richness to your paint. (Liquin should be considered as an enrichening agent. That is; not lean, nor neutral.) You might wish to drain some of the linseed oil out of your paint blobs first by letting them sit on an absorbent paper for a few minutes before putting them on the palette. Then, when you add the poppy-seed oil, you'll just be re-oiling the paint back to somewhere near its original amount.
Another option might be to purchase paints (as you need them) that already have a slower-drying oil as their vehicle. I believe that most of W. H. Graham's colours are ground in Walnut oil. Also, there's an outfit in New York (whose name escapes me at the moment) that makes hand-ground colours using your choice of walnut or linseed. If you're interested I can dig around in the bowels of my computer and see if I still have a reference for them.
I suspect that the greatest negative commentary you may receive about your proposed method is that poppy-oil is the weakest binder of the major paint vehicles, which may serve to compromise the paint layers. Of course, the counter for that is that you will be adding Liquin, which is a stronger binder.
Anyway, we'll see what others have to say.
All the best.
Juan
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