Acrylics on Glass (my palette)
Acrylics on Canvas
Side by side they could almost be two paintings.
And what do pen sketches and painting have to do with calligraphy? ... a great deal!
Any type of drawing is invaluable to calligraphic studies.
If you are starting out in calligraphy I would make a habit of drawing every day
... just some little thing ... do this just for yourself.
Take drawing classes parallel with your calligraphy classes.
You will be all the better for it. Enjoy and learn.