Japanese artist Sayaka Ouhito is an illustrator, and perhaps a concept artist. I’m unsure about the latter as I can’t read Japanese and, save for this relatively uninformative interview, there seems to be very little information available about her in English.
Other than that, I know little about her, just my own impressions of the delightful drawing and Miyazaki-like charm that make her work so appealing.
This gallery on her website is the best source for her work, though I found looking through the rest of the website difficult and unfruitful, more because of the lack of clear identification of links than the language barrier.
She also has a blog, which includes some larger versions of works in the previously mentioned gallery, as well as others, but takes some digging through photos of cute animals and such to get to them.