FbF animation smoothing

Hi people,

I am a newbie in Harmony. I have been animating in Toon Boom using rigging and bones. Now I am trying to draw a short cartoon using frame by frame drawings. Is there a way to smooth transition between the drawings? For example my next picture is just popping up after the previous, it looks kinda artificial. The blur-motion is not an option as it doesnt work with drawings. Shall I just draw in every “seconds” or “thirds”?