(It's been over 20 years since I last used it, so I don't know where to start other than saying you'll probably need to use DOSBOX to run it.
I also used a graphical program for starting with long ANSIs that basically used the half-character blocks to start with basic pixels, but I don't remember the name. (Basically, the characters that turn 80x25 text into 80x50 pixels.)
Then, with the jump to 14.4k it was like, "wow, a whole PAGE of text practically just pops up!" One whole... screenful of bytes. Wow.
Then you'd start an XMODEM transfer of a single image file and go make dinner.
[1] http://picoe.ca/products/pablodraw/
[2] https://www.gridsagegames.com/rexpaint/
Decent online one here as well: https://asc-paint.glitch.me/