For your marketplace, a professional LOGO, banners, and product images re very important to gain trust from vendors and customers.
For your marketplace, a professional, clean, and beautiful LOGO is very important to gain trust from vendors and customers.
You will need sliders and banners from time to time to run your marketplace. This may be occasional or periodic but continuous work.
E-commerce business mostly depends on product image quality. Customers will buy a product just viewing the images, not the actual product.