For the best quality carving, it's always better to start with a vector file in .SVG (or .DXF) format than a pixelated image in .JPG format (though you can certainly trace an image as well). You can create these vector files using CAD software such as Illustrator or AutoCAD, or, you can use Google's Advanced Image Search to find .SVG files from the Internet.
The advanced image search provides lots of options to choose from as you can see from the screenshot above, though the one you'll want to utilize is "file type." Within that category, choose "SVG files" from the dropdown list:
Start by using any keywords you want to search for, just as you would any other Google search. In this example, we'll be using French Fries:
You'll be met with lots of options to sort through:
Quite a few of these results may be a preview of the .SVG file in .PNG format, so you will need to click through to the source page to find the actual .SVG file. You can see when right-clicking and choosing "Save Image As.." from the initial results page shows the file type as .PNG:
But when you click through to the source page, you should be able to find the .SVG file:
From there, save the file to a known location and import into Easel:
Here are the final results!
Of course, results may vary depending on the source image, but this is a great method to help in your search for vector files.
Disclaimer: Please make sure to adhere to any copyright rules outlined by the file provider. The French Fries icon that was used in this example was attributed above per their guidelines.