The last time I used Hugin was about 5 years ago, but at the time it was my go-to software for panoramas. To get the best results you want to have a good amount of overlap between the images, and make sure everything is very level. Here's one that will give you an idea: https://www.flickr.com/photos/joshbg2k/3382847846/sizes/o/

You can't see too much detail there, but I have a 6' long print of that image and it's perfect.