Images in HTML text based games - Dos and Don'ts

[Nobody Cares]

I have finally found an artist that I really like and I think I will commission him some art for my game. Unfortunately, I cannot afford fully coloured and shaded illustrations, it would make the project prohibitively expensive and time-consuming. I am looking for an elegant yet affordable solution. Any suggestions?

Also which illustrations should I prioritise and how should I insert them in a game that will fundamentally remain text-based?

Thanks upfront, everyone