I have 3 ordinary moggies, all rescued cats, and I specialise in animal painting. I don't do very many painting a year as I take time to get in lots of detail, and fit in my own paintings around all my tutoring work. I have recently had my first book published (Ready to Paint Cats and Kittens) and I had only 4 days to do the 5 step by step demonstrations that are in the book. This was quite a challenge to do in such a such a short timescale.
You shouldn't be concerned about the volume of work you do as it is more important to enjoy what you do, learn from each piece, and continue to challenge yourself artistically. If something doesn't work too well at the first attempt, have another go or several. You will improve each time, even if you feel you aren't making any progress. If you keep all you do, even the ones you think are rubbish, you will be able to compare them with new work. This will show how you are getting better and can be quite insightful about how you work, what colours you favour, and all sorts of things.