I would, in the process of refreshing what you've already got, embelish and expand what is already there. You could join them in that process.
You would need to find the right artist for that endeavor, and we can help with that. Where do you live?
So, I got these 2 pieces about 10 years ago and haven't really touched them up ever since. Now I want to join both of them and, of course, re-color or retouch them, as well. I usually go for flowers only but it can be something else... Does anyone have any ideas that might look good? I really don't know how to join the two of them!