array (
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  'post_status' => 'publish',
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  'orderby' => 'title',
  'order' => 'DESC',
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  'tax_query' => 
  array (
    'relation' => 'AND',
    0 => 
    array (
      'taxonomy' => 'pa_zwgrafoi',
      'terms' => 
      array (
        0 => 'Chantzaras Apostolos',
      ),
      'field' => 'name',
      'operator' => 'IN',
    ),
    1 => 
    array (
      'taxonomy' => 'pa_silloges',
      'terms' => 
      array (
        0 => 'Small Paintings',
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      'field' => 'name',
      'operator' => 'IN',
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)

array (
  'post_type' => 'product',
  'post_status' => 'publish',
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  array (
    'relation' => 'AND',
    0 => 
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      'taxonomy' => 'pa_zwgrafoi',
      'terms' => 
      array (
        0 => 'Chantzaras Apostolos',
      ),
      'field' => 'name',
      'operator' => 'IN',
    ),
    1 => 
    array (
      'taxonomy' => 'pa_silloges',
      'terms' => 
      array (
        0 => 'Art Objects',
      ),
      'field' => 'name',
      'operator' => 'IN',
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)

array (
  'post_type' => 'product',
  'post_status' => 'publish',
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  array (
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    0 => 
    array (
      'taxonomy' => 'pa_zwgrafoi',
      'terms' => 
      array (
        0 => 'Chantzaras Apostolos',
      ),
      'field' => 'name',
      'operator' => 'IN',
    ),
    1 => 
    array (
      'taxonomy' => 'pa_silloges',
      'terms' => 
      array (
        0 => 'Silkscreens',
      ),
      'field' => 'name',
      'operator' => 'IN',
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)

array (
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  array (
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      'field' => 'name',
      'operator' => 'IN',
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    array (
      'taxonomy' => 'pa_silloges',
      'terms' => 
      array (
        0 => 'Painting',
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      'operator' => 'IN',
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)