If you already have a TDX file with the appropriate name you can simply add that file to the DATA_ALL_PLATFORMS\ART_ASSETS\ILLUSTRATIONS directory in either a wad you already have or the custom data folder that can be created by the Deck Builder (DATA_DLC_DECK_BUILDER_CUSTOM).
If the TDX file does not have the appropriate name (or you don't know if it has an appropriate name) then you need to check the Card XML for the card you intend to use the image with. Look at the ARTID tag to see what the filename should be. If you see a tag like this:
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<ARTID value="139750" />
Then your TDX file should be named: "139750.TDX"
If the tag looks like this:
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<ARTID value="A127380" />
Then your TDX file should be named: "A127380.TDX"
If you do not have a TDX file of the image you only have a JPG or PNG then you need to convert to TDX. You can use Gibbed Tools TdxConvert to change from JPG or PNG to TDX. If you want an uncompressed TDX you can just drag and drop the image on TdxConvert, if you want a compressed TDX file then you need to compress it using either Eglin's Tool or my modified Gibbed Tools and follow the instructions for the tool you are using. Compressed images need to have dimensions that are a multiple of 4 (for regular cards the game uses and prefers images with a size of 512x376).