did these for a project in school, would have worked on some of them more but unfortunately ran out of time. constructive criticism always welcome.

i like 1/4

the first one is probably the best out of all.

almost all lack perspective basics and pretty much lack a focal.

My eye doesnt really rest throughout these pieces... to many soft blending

your color variation isnt that strong. you will have a green of a certain hue and thats it. You need to vary colors within color if that makes sense. If you have a green, add some warm variations of that green , or cool depending on the composition. For example take your last posted piece. Theres 1 green throughout the whole piece, it may vary in tint/shade, but thats not very interesting.

the foreground in the first piece is very well done, as is the rock in the third. Im guessing you had some sort of visual reference for both. as for the rest, they dont seem to be very believable as a 3 dimensional object. There pretty flat and lack form and volume.

but out of all this, I believe the perspective is what is making these works lose there strength.

i agree with all of that, i guess i thought similar colors would unify the pieces, but especially the last one seems very monotone. by perspective do you mean dimensionality and atmosphere? i guess a variation of warm and cool colors would help with that, but as paintings i figured looking flat was alright, and i wasn't going for realism in any of these. it was fun to experiment with random brushes and techniques, but i should probably watch some of your tuts before attempting any more