In my experience, it is relatively easy to imagine sights but not so easy for smells, tastes, sounds and feel. Also, it is easier to imagine things that you have had direct experience with before (e.g. making a cup of coffee) compared to something that you don’t (e.g. a snow-capped mountain).
Nevertheless, this is an eye-opener as my prior imagery experiences were mostly confined to sights, plus a bit of sound and feel. I used to play recreational football as a striker for my academic class and company, hence I mainly imagined myself scoring goals in ways that were done by world-class strikers (I watch lots of YouTube videos on football and imagine myself playing like professional footballers too!).
It definitely takes practice to attain a full, vivid imagery experience!