Hello Ofi Khan
In the first photo you can see the addon "articles". The first article does not display any image because the blog image was not used, but I used the joomla full article image.
In the second photo you can see that, for the same reason, how the articles appear in the blogbiew.
In the third photo, you can see the photos that Helix produces from an original image. You can see that from a 1200X800 57.48Kb image, it produces four images with a total weight of 600kb. The Large Image to be used in the addon Articles Slider is 1140X750 / 389.28kb and the result is low image quality (and this is a logical result, from a 60kb image). So I prefer to use native joonla images or a customfield. But then, article sliders have no image. And a slider without an image does not make sense. 
Miltos