app for "watercolor" drawings of tree guilds

I love the way these watercolor drawings of tree guilds look:  https://lynehamcommons.files.wordpress.com/2016/08/wp-image-154878437jpg.jpeg?w=748


However, not having much experience or talent for watercolors, I was wondering if there was an app that y'all (I'm from Texas, see...) would recommend where I could lay out my guilds and gardens that will have the watercolor look.  I've got the "technical looking" overlays with Google Maps and stuff and spreadsheets galore, but I would enjoy a more artistic aesthetic.  

Any recommendations?

TIA!

This is probably not what you are looking for though I will mention it.

Waterlogue will turn photos into watercolors.

That's a beautiful picture!

Sorry I do not know of an app that would do that for you beyond just any drawing or painting app. You might have luck finding an artist to do it for you in someplace like Etsy.

I've been wanting to do something like that for a while. I made a big chart on my computer and printed it out.  Now I just need the time to trace it out on watercolor paper and give painting it a try. I don't think it'll be very difficult- it's just blobs and circles and splatters.