How would I convert a google image into roblox parts?

it seems like it is hard

You would be best off having a remote server do this. Otherwise you'll have to find a way to interpret every bit and byte of data in the response from HttpService, and just getting that information would be convoluted enough. So, using another language on a remote server, or perhaps even using Lua and some library such as imlib2, and using HttpService to reach that remote server as a middleman would be best. You then could simply loop through each pixel and create a block with the closest BrickColor relative to the color of the pixel.