wp_query sort with meta_value_num is not working

by

From your comment:

it worked without the array( 'key' => 'picture_url', 'value' =>
'none', 'compare' => '!=' ) but I need to include it in the query…
is it possible?

Yes, using named sub-meta queries like so:

$q_args = [
    // ... other args here ...
    'meta_query' => [
        'picture_url' => [ 'key' => 'picture_url', 'value' => 'none', 'compare' => '!=' ],
        'totalviews'  => [ 'key' => 'totalviews', 'value' => '0', 'compare' => '>=', 'type' => 'NUMERIC' ],
    ],
    'orderby' => 'totalviews', // set this to a key in the above meta queries
    'order'   => 'DESC',
];

The orderby parameter can also be an array:

'orderby' => [
    'totalviews'  => 'DESC', // sort by meta_query key
    'picture_url' => 'ASC',  // sort by meta_query key
    'date'        => 'DESC', // sort by the post date
]

And (once again), orderby is not a valid argument for an array in the meta_query array. See here for more details.