I know who that is - it’s Sans and Papyrus from Undertale, isn’t it? 
(love Undertale!)
If I’ve recognised it, she must have talent 
There was a thread on here a couple of weeks ago about a similar thing - OPs daughter was a brilliant artist, had taken gcse art and op was asking what to do to go further. IIRC the consensus was that Etsy is a bit too... formal, too much for a young artist, very competitive. A lot of people make money on Etsy but it’s not instant success. Please don’t tell her this, I don’t mean it horribly!!! It’s just that Etsy may not work out so well for her if she’s expecting the instant success iyswim?
Has she tried posting on tumblr? I’m just thinking - perhaps if she builds up some sort of name for herself, a little brand called, I don’t know, AThingsDD Artwork, by posting her work on tumblr, Instagram, she’ll transition to Etsy easily.
Or perhaps - has she got a deviantART account? I suggested this on the previous thread - promise I’m not an employee haha - but deviantART is great for young artists like her, and covers a whole range of artwork. Means she can be influenced and work with other styles too. It’s a website where users can submit their art, and get critiques and commissions if possible. Plus, for example, she can join ‘groups’ - so say she posts a picture of Sans from Undertale on deviantART, she can search for an Undertale group on the site, add it to the group and get more exposure/make friends. I think there is a ‘paid prints’ section too where she can charge people to buy her work but I’ve not worked with that. Admittedly there are some nude/pornographic images from time to time BUT these can be filtered out completely with the mature content filter.
All in all... amazing work, tell her she should be proud of herself