In your Bol.com seller account you can select the 'view' of the images you want to upload (front, side, back view, etc.). In Channable you cannot select the view of your images. You cannot configure this in Channable because this information is not in Bol.com's Datamodel, on which the content you send from Channable to Bol.com is based.
If you want to configure the views of your images, you will need to do this manually in your Bol.com seller account. More information can be found here under "afbeelding toevoegen of wijzigen" (Dutch only).