So I figured it partly out, my only issue now is that there is a restriction to the image size, or it just won’t allow me to insert the full size of the image.

I tried to make the background-size as small as possible, and made sure the image had the same px, but the issue was still there. Lastly, here is my testimonials.liquid file code. Any help will be much appreciated! !
{%- style -%}
.testimonials-{{ section.id }} {
background-color: {{ section.settings.color_background }};
color: {{ section.settings.color_text }};
}
}
{%- endstyle -%}
{%- if section.settings.title != blank -%}
## {{ section.settings.title | escape }}
{%- endif -%}
{%- if section.blocks.size > 0 -%}
{%- for block in section.blocks -%}
> {%- if block.settings.icon == 'quote' -%}
>
> {%- elsif block.settings.icon == '5-stars' -%}
> ★★★★★
> {%- elsif block.settings.icon == '4-stars' -%}
>
> {%- elsif block.settings.icon == '3-stars' -%}
> ★★★
> {%- elsif block.settings.icon == '2-stars' -%}
> ★★
> {%- elsif block.settings.icon == '1-star' -%}
> ★
> {%- endif -%}
>
> {%- if block.settings.testimonial != blank -%}
>
> {{ block.settings.testimonial }}
>
> {%- endif -%}
>
> {%- if block.settings.image != blank or block.settings.author != blank or block.settings.author_info != blank -%}
>
> {%- if block.settings.image != blank -%}
>
>
> {%- assign img_url = block.settings.image | img_url: '1x1' | replace: '_1x1.', '_{width}x.' -%}
>
>
>
> {%- endif -%}
> {%- if block.settings.author != blank -%}
>
> {%- endif -%}
> {%- if block.settings.author_info != blank -%}
>
>
> {{ block.settings.author_info | escape }}
>
> {%- endif -%}
> {%- endif -%}
{%- endfor -%}
{%- endif -%}
{% schema %}
{
"name": "Customer testimonials",
"max_blocks": 9,
"settings": [
{
"type": "text",
"id": "title",
"label": "Heading",
"default": "Don't take our word for it"
},
{
"type": "checkbox",
"id": "round_images",
"label": "Circular images",
"default": true
},
{
"type": "color",
"id": "color_background",
"label": "Background",
"default": "#f9f9f9"
},
{
"type": "color",
"id": "color_text",
"label": "Text",
"default": "#1c1d1d"
}
],
"blocks": [
{
"type": "testimonial",
"name": "Testimonial",
"settings": [
{
"type": "select",
"id": "icon",
"label": "Icon",
"default": "5-stars",
"options": [
{
"value": "none",
"label": "None"
},
{
"value": "quote",
"label": "Quote"
},
{
"value": "5-stars",
"label": "5 stars"
},
{
"value": "4-stars",
"label": "4 stars"
},
{
"value": "3-stars",
"label": "3 stars"
},
{
"value": "2-stars",
"label": "2 stars"
},
{
"value": "1-star",
"label": "1 star"
}
]
},
{
"type": "richtext",
"id": "testimonial",
"label": "Text",
"default": "
Add customer reviews and testimonials to showcase your store’s happy customers.
"
},
{
"type": "image_picker",
"id": "image",
"label": "Author's image"
},
{
"type": "text",
"id": "author",
"label": "Author",
"default": "Author name"
},
{
"type": "text",
"id": "author_info",
"label": "Author info",
"default": "Los Angeles, CA"
}
]
}
],
"presets": [
{
"name": "Customer testimonials",
"category": "Text",
"blocks": [
{
"type": "testimonial"
},
{
"type": "testimonial"
},
{
"type": "testimonial"
},
{
"type": "testimonial"
},
{
"type": "testimonial"
}
]
}
]
}
{% endschema %}