/ic/ - Artwork/Critique

I posted this on /beg/ but got no replys
I just gotta get some critique on the colors(and everything else, honestly) and some help on working with PS, been using SAI for a long while and i've been feeling kinda stuck.
The blending on SAI is, to me, the best possible, and the way i change brush sizes too, i just hit the shortcut, move the pen a bit and set the size. Is there a way to get that same thing with PS?

Heyo, i'm a retard and have been putting off painting shit for a while, and also been putting off making the switch to photoshop because i've grown too reliant on SAI for it's blending
I wanna know a few things:
>How are my colors
I always feel i muddy it a lot, i liked the ones here but i might not be seeing it right
>Which courses on environment/landscape paintings you guys recommend?
I've been watching some Noah Bradley videos and Marco Bucci for some advice on colors
>Is is possible to switch the brush size on the go
I LOVE the sai brush size thingy, i just press ctrl alt and pull my hand around to get the size i need, it's convenient as fuck. If i could get that on PS i'd love it
>Is it possible to have blending as good as SAI
Long shot, just love the way it reacts when i just go fucking ham to get more colors

That's it i think, would love some opinions and feedback, especially on the brush size thing