Help with design software

Hi.
I want to design a project for a client, but this time I need to give a professional look.
I've tried my hand with autocad which looks good for technical stuff, but it is not very appealing for clients. I've also tried to make photo makeup with inkscape, and the result is awful.

There are a few software applications that simplify the design, with many assets and that are visually appealing, although they are expensive. I don't mind to pay for one license if it makes my clients happy and willing to build a garden with me. But before I expend my money in any software tool...

Do you have any recommendations?

Bonus if it works for Linux.

Hi Abraham,
What kind of projects are you working on? You mention gardens? Is this for landscape design stuff with buildings and plants? Or mainly garden with primarily plants?

For the moment, I'm focusing on small private gardens, hopefully with a good diversity of plants, and some furniture and garden features like bird fountains.

there was a convo on Reddit that had a few suggestions https://www.reddit.com/r/Permaculture/comments/16d32k0/free_landscape_design_software/

this one seemed to be well liked and easy-ish
https://permapeople.org/plans/new

Good luck. Stuff with graphics is always the hardest part about my work (I'm a word and a plant person).

Thank you.
So far, inkscape seems to be the most professional and free (and it is included in most linux distros), but it doesn't have ready to place assets. If I want to draw, say, a carob tree, I need to find the pictures and then add it as an object.
The permapeople tool seems good for designing a guild, but my clients probably want to see how it will look after planting, not just where plants are going to be planted.

Well, after trying Inkscape for a while, I've settled with Krita, a painting software like the Windows Paint. It turns out that drawing with brushes is easier than getting pictures of the plants.