Is this a good workout to tone my body?

Your workout generally look pretty good because the key to toning is high reps and low weight or resistance and you have that down. If you're looking for more developed better looking abs then add some more exercises to your workout. Just doing crunches or sit ups isn't as effective as doing 5 or 6 other ab exercises such as oblique v-ups, mason twist, heal raises ect. Doing a wide range of ab exercises will target your entire core thus providing for better results. Other than that you're workout looks great except try and build upon it by adding more exercises to mix up your workout that's more effective as well.