I would say...for the BG and such help....check out some of tutorials and take a lot of time over them....(i personally can never be bothered putting in the effort to make a background, cause it takes so much time)
how cute! I have no tips for digital art, just remember to add mushrooms!!!!!!!! (are those already mushrooms?) the one fox looks pretty angry lol. I like it so far, I guess go look at other references?