For colored pencils and a felt pen, great job. It's pretty clean and the colors are nice. One piece of advice I think you might know of is using tissue paper to rub your colors out smooth. I think you used that technique in this picture. Anyway, nice job.
I don't really have much to say to this piece it's nicely done, all the characters blend together and none seems to stick out in a wrong way like it doesn't belong in this crowd. The colors are easy on the eyes and works very well with the design of the characters that have as viewing target people of very fragile age. Keep up the good work ^^