As NN indicates, you can't email a folder. If you want to bundle the files together you'll need to 'zip' them (i.e. compress them into a single file) and the recipient will then have the 'unzip' (decompress) that file. Since you don't want to do that you'll have to attach the pictures as separate files.
Sending them as single pictures will probably work but email servers each have a maximum total size for email attachments. Some allow you to attach up to 10Mb (or, occasionally, more) to a single email but others put their limit much lower (at 2Mb or 5Mb). So you might find that you'll need to spread your attachments across several emails.
Chris