Hello:
Well, it's true that Mirage was like DPaint because some of theirs programmers came from EA in the creation of the software.
First was DPaint, then TVPaint for Amiga, in their incarnation for PC became Aura, Mirage and it is a Version of TVPaint 8.5 recent out.
I work in DPaint some time ago and really love Mirage, work in the same way like Amiga. The animbrushes are great. In my office we use it and don't like any other.
Greets