Although the responsive design works across desktop, tablet and mobile as it reaches the breakpoints I would make it more responsive so the images and text change in size between designs.
What challenges did you encounter, and how did you overcome them?I had some issue with the source and the srcset attribute not loading the correct size images, only used these once or twice so I'm still getting my head around the how they fully work. I've had issues before where it doesn't load but have read sometimes the image gets cached and doesn't load the alternative one when it should. This method doesn't seem that reliable...
What specific areas of your project would you like help with?In the screen shot it seems to be loading the tablet image but seems to work fine when the site is viewed in a browser, Any ideas as to why this is? Thanks...