Best approach for Resource Managment.

1

Hello guys, i’m pretty new to MonoGame, coming from a LibGDX background.
While working on a 2D side-scroller, I came-up with a little problem: Resource Managment.
I have one Singleton class named ResourceManager. Something like:

public class ResourceManager
{
     private Dictionary<string, Texture2D> mTextures;
     //Get/Set Texture code
     //Singleton Code
}

After that, I have some entities, like Player that uses ResourceManager like this:

public class Player : Entity
{
     //Some code here
     private Animation mWalkingAnimation;
     private Animation mHeadWalkingAnimation;
     public Player()
     {
            Texture2D texture = ResourceManager.Instance.GetTexture("character_full");

            mWalkingAnimation = new Animation(texture, 1.0f / 6.5f);
            mWalkingAnimation.AddFrame(new Rectangle(40, 18, 18, 46));
            mWalkingAnimation.AddFrame(new Rectangle(74, 18, 11, 46));
            mWalkingAnimation.AddFrame(new Rectangle(107, 18, 10, 46));
            mWalkingAnimation.AddFrame(new Rectangle(136, 18, 18, 46));
            mWalkingAnimation.AddFrame(new Rectangle(170, 18, 11, 46));
            mWalkingAnimation.AddFrame(new Rectangle(203, 18, 9, 46));

            standAnimation = new Animation(texture, 1.0f / 1.0f);
            animation.AddFrame(new Rectangle(7, 18, 16, 48));

            texture = ResourceManager.Instance.GetTexture("head_hair_dark"); 
            mHeadWalkingAnimation= new Animation(texture, 1.0f / 8.0f);
            mHeadWalkingAnimation.AddFrame(new Rectangle(4, 30, 17, 34));
            mHeadWalkingAnimation.AddFrame(new Rectangle(34, 30, 20, 34));
            mHeadWalkingAnimation.AddFrame(new Rectangle(69, 29, 13, 35));
            mHeadWalkingAnimation.AddFrame(new Rectangle(100, 29, 15, 35));
            mHeadWalkingAnimation.AddFrame(new Rectangle(130, 30, 20, 34));
     }
}

(Avoid the Head Walking Animation, i know it should be in some sort of Item object, it was just for testing).
Is there a better way of handling resources?
Another question is, do you think I should create general animation variables (like mWalkingAnimation, mStandingAnimation, etc) in Entity?