You did a great job to create different atmosphere through each track, it fits well with the paintings.
I like that minimalistic approach with piano only, it creates a cohesive sountrack !
If I would suggest some improvements, I think your melodies contain great ideas, but lack some direction and structure, but there's a very healthy foundation !
And personnaly I would add a bit more chords and harmony to fill the space, and add more dynamics changes to outline those melodies (but it could sound too busy for what you were going for, so it's just a matter of personnel preference)
Savage State is my favorite, I really liked what you did with this one, it's very peacefull
Overall it's been pleasing to listen to, great job !