The Star Wars alien is roughly 3-3/4 inches tall.  To get a sense of scale, look at the first photo and compare him to the Liv doll, which is about 11-1/2 inches tall.

Yeah, matching paint is tricky.  What I usually do is have all the component colors laid out in front of me, and then I mix and match a little here and there on my brush until I get something close.  Paint sometimes looks different when its dry though, so, even if it looks perfect when its wet, sometimes you find you were off the mark later.  I think I came pretty close on the orange, but that brown skin thwarted me (the toy's skin coloration is actually a mustard yellow dry-brushed onto reddish-brown plastic).

I have very little patience and my hands have a tendency to shake when I do fine work (my biochemistry lab partner in college nicknamed me "Whiskey Fingers"), and I still manage to do all right painting tiny stuff.