You should probably edit your post to include your program in text format rather than on just an image.

Your program is also missing sets and reps for each exercise.

I'd remove wrist curls from a full body workout and replace them with something else. Other than that it should be good.

I cant read your writing super great but it looks like there isn't much back work there. You could swap wrist curls for bent over dumbell rows.

I) Morning walk & hanging

II) Evening exercise (1 per muscle group) (once in 3 days)

1. Bicep curl
2. overhead curl
3. Shoulder press
4. Wrist curl
5. Push up
6. Crunches, side plank
7. Pistol squat, claf raise

III) Stretching, mobility in gap days

If you're looking for advice, I'd recommend moving the compound movements (ie squats and presses) to the beginning and the isolation movements (ie curls) to the end.

This allows you to do the more complex movements at the beginning when you are less tired.

Good work :)

The morning activity reads "walk, lunges", right? Don't forget to do something for your hamstrings as well, like (weighted) single leg Romanian deadlifts or Nordic curls. Otherwise they'll become undertrained and susceptible to injuries.

What’s #4?

Why once in 3 days? You should be fine to do this every other day

What's your goal with the exercise plan? If it's just for general fitness, wrist curls and calf raises will mostly be a waste of time.

If it's for bodybuilding/aesthetics, the volume is way too low. Forearms and calves can easily be trained 3-4 times a week.