the icon is loaded in the database, but is not displayed in the interface

image field on odoo settings

settings.xml
<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <data>
        <record id="res_config_settings_google_map_view_form" model="ir.ui.view">
            <field name="name">Google Map Settings</field>
            <field name="priority" eval="200"/>
            <field name="model">res.config.settings</field>
            <field name="inherit_id" ref="base_setup.res_config_settings_view_form"/>
            <field name="arch" type="xml">
                <xpath expr="//div[@name='integration']" position="after">
                    <div name="google_map_configs">
                        <h2>Google Maps Configs</h2>
                        <div class="row mt16 o_settings_container">
                            <div class="col-xs-12 col-md-6 o_setting_box">
                                <div class="o_setting_right_pane">
                                    <div class="content-group">
                                        <div class="mt16">
                                            <label for="google_maps_view_api_key" string="Api key"/>
                                            <field name="google_maps_view_api_key"/>
                                        </div>
                                        <div class="mt16">
                                            <label for="google_maps_marker_icon" string="Marker icon"/>
                                            <field name="google_maps_marker_icon" widget='image'/>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </xpath>
            </field>
        </record>
    </data>
</odoo>


models.py
class ResConfigSettings(models.TransientModel):
    _inherit = 'res.config.settings'

    google_maps_view_api_key = fields.Char(
        string='Google Maps View Api Key',
        config_parameter='smart_light.api_key')
    google_maps_marker_icon = fields.Image()