Images on your website should be crisp and clear to attract customers to your products. In order to do this you need to upload high resolution images.
This blog article goes through some best practices for your images: What size and type of pictures should I upload to websites?
It is recommended that your image is twice the number of pixels of its intended width, this allows it to be a clear image for those using a Retina screen. It is better to have a larger image as when it is scaled on different screen sizes it will appear consistent to more viewers. As a general guideline, it is recommended to add pictures larger than 2400px in width in order to support retina screens.
Images on your Rocketspark website have maximum sizes. Feature slide images have a maximum size of 15mb whereas other areas such as picture blocks have a large maximum of 100mb. The larger the file, the clearer the image will appear to customers.