Adding and practicing backgrounds can really help add a sense of emotion and can make a drawing overall a lot better, so I really encourage you to do them! The only real downside I found with them was that they tend to be tedious at times, but I learned to have fun doing them.
I really like your last drawing. Strut's dinosona's hat looks very cute.
The background also looks very good.
What you draw next should be entirely up to you. Whether it be a character you like, another dinosona for someone, or something completely different!