DnD is actually how I got into drawing in the first place!
When starting out with art, the three most important things you need to develop are:
- Ideas for things to draw
- Drawing regularly (as frequently as possible ideally)
- Getting some critical feedback for where to improve.
Tabletop is an excellent vehicle for delivering all of this, because each session you do some new things, often quite visually interesting things. This gives you an ever-growing bank of dynamic ideas to draw, as well as several other invested people to look at your art and give you feedback :)