The first one sounds like it was just a FLD. The second one definitely was a lucid dream; congrats on your first! It is very normal, if not expected that your dream will start fading once you become lucid at first, and with practice it will get better. I recently had my fourth LD and it didn’t fade when I realized I was dreaming, but it did when I tried to change my dream. On the topic of making your dreams more vivid, I suggest this. It should help if you put in the effort. And finally, after you wake up from a LD you should ALWAYS do a RC. You never know when you may still be dreaming, but your subconscious tricked you with a FA.