web/web_widget_digitized_signature/views/res_users_view.xml

<?xml version="1.0" ?>
<odoo>

    <record id="inherited_res_users_form" model="ir.ui.view">
        <field name="name">inherited.res.users.form</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="base.view_users_form"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='signature']" position="after">
                <label for="signature_image" class="oe_edit_only"/>
                <h2><field name="signature_image" widget="signature"/></h2>
            </xpath>
        </field>
    </record>
    <record id="view_users_form_simple_modif" model="ir.ui.view">
        <field name="name">res.users.preferences.form</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="base.view_users_form_simple_modif"/>
        <field name="arch" type="xml">
            <xpath expr="//field[@name='signature']" position="after">
                <label for="signature_image" class="oe_edit_only"/>
                <h2><field name="signature_image" widget="signature"/></h2>
            </xpath>
        </field>
    </record>

</odoo>