hmmm
you must name nichelings letters, alphabetically. (the first nicheling would be A, the second B etc) if you think a single letter is boring you can do names starting with the letters or add a second letter
-if you have a cat, go look at them
-google a picture of a cat and draw shapes over it, see what kinds of them make up the silhouette
when it comes to art tips in general, this video pretty much covers what i would say