Right, so let's make something straight here.



First you have this pose, which is just heart-warming.



Then you have the modified proportions that make the image even more heartening.



And then you've added those warm colours, making it so adorable that my adorable-counter just exploded and almost took off a couple of my fingers.



No, really, this is one of the most adorable pieces of UT fanart I've seen in quite some time, especially Toriel's face.



Just out of curiosity, when it comes to the lights, did you use just one layer for the lighting/highlights?