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Although I'm not strictly a portrait artist, I use a variety of mediums, from oils, casein, gouache, acrylic, etc. They each have strengths or weaknesses depending on use and expectations of the artist.
I have been curious about the Open product since first hearing about them and have heard good reports to date. Some of the negatives I've heard are that they're a bit thinner than regular heavy-body acrylics as the pigment load is less. Also that they were not designed for thick impasto; although, I don't usually paint that way, and the color choices are currently not as large as regular acrylics. What's preventing me from testing them out right now is I'd have to replace my current supply of paints which I'm in no hurry to do.
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