Framing tree sketchings together

Framing options - Putting three small paintings together

I recently did a series on tree sketchings. Decided to put them together using PicCollage App so as to get an idea regarding what it would like if framed together. Small paintings can be framed in many different ways, and this is one of the options. 

Framing of three tree sketchings done using white soft pastel

and black charcoal pencil