Hmm, since oekaki lets you insert hex codes for colours, I guess you could try to get those values of the colours? :3
If nothing else works, I guess you could bring the character into paint, pick the colours and get the RGB values for them and then convert RGB values to hex code
here. ouo;;
That's a bit of a hassle though, so if you have Gimp or Photoshop, then by all means, use the colorpicker there to get the hex code. :'D
There must be simpler way to do this but I don't know, sorry. D:
And ohh, to insert hex code for a colour, click on the box under the colorpicker.
