If you want blunt and honest criticism, then I'm your girl
For reference it would be helpful to see the 'before' image. But this is my evaluation of the piece on its own.
Overall its relatively pleasing to the eye, not gallery standard but maybe hanging in a hotel lobbey or restaurant

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I would have liked to have seen more form and definition in the man made structures, you're a little smudgy on some of those edges.
Theres a great sense of movement but I think its a little too much, the flow is in multiple directions and it has a very hap-hazard feel to it, it feels more gale force winds than 'gentle breeze on a summers day'.
Its also lacking a little depth perception. The bench looks completely swamped in plants, whereas I assume its really just there are plants in the foreground obscuring the view. I would like to see a little more detail and delicacy in those foreground plants, particularly the red plants on the right hand side, they're very smudged and look rushed.
The grass is very good, gives a great impression of a lush, neat lawn without being obsessively detailed.
Overall its not bad but it could use some work to live up to its full potential. I dont use a tablet so I cant help you with that and you seem to be doing fine with painter. I think your technique is fine but you need to work on your attention to detail and composition.