The New Products widget is not showing all product images
Please go to your administration panel, Select Design > Themes (click on the name of the active theme). On the Sections tab on the left, find the area where the new product widget is and click on that area on the image. Under Widgets in this Section, select the new products widget by clicking on the text. Towards the bottom of the popup page, under content, make sure Show First Product Image Only: is unticked and Press Appy and Close.
