https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1626446610
I did it today, so it was true challange for me ingame. I write programm on Python to convert pixels from jpg to arc sign code and after I edit and align this numbers to 62 arc sigs. Im write here my Python code:

from PIL import Image
image = Image.open("star.jpg")
width = image.size[0]
height = image.size[1]
pix = image.load()
k = 0
for j in range(height):
for i in range(width):
a = pix[i, j][0]
b = pix[i, j][1]
c = pix[i, j][2]
aa = hex(a)
aaa = aa[2:]
if len(aaa)==1: aaa="0"+aaa
bb = hex(b)
bbb = bb[2:]
if len(bbb)==1: bbb="0"+bbb
cc = hex(c)
ccc = cc[2:]
if len(ccc)==1: ccc="0"+ccc
with open("starry"+str(k)+".txt", "a") as starry:
starry.write("<#"+aaa+bbb+ccc+">.")
if j%3==0: k=k+1

so if you want add picture with Grumpy Cat to your ingame art gallery, enjoy^^