Whats a good sketch app (android/pc compatible) to draw trees on?

[justBonsai]

I'd like to take images of trees I have, take their outline and add to it to create a potential future image of the tree. I've seen several users here posting really nice quality computer sketches and would like to know what software you use.

Thanks,
Julian

 

[thomas22]

I use this photo editing web site for my verts. The clone stamp is the most useful tool but you can do many other things on this site. I'm no expert and this is the only site I use but it works for my purposes.

https://pixlr.com/editor/