You'll want to do something like this (you might need to switch to Dreamwidth's HTML editor, if you're already using the Rich Text editor, to add the additional HTML to already-posted image links):
The part that re-sizes them is at the end: height="420px" width="420px". You'll want to play around with the values to get the pics the size you want, though.
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
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Date: 2019-03-06 04:59 am (UTC)<img src="https://intoolate.files.wordpress.com/2019/02/signature.png" alt="describe image here" title="describe/title image here for mouse hover" height="420px" width="420px">
The part that re-sizes them is at the end: height="420px" width="420px". You'll want to play around with the values to get the pics the size you want, though.