Hi Chris, I might be repeating some of Shani's feedback as I'm just trying to quickly provide some between other tasks.
You have some really fun colours going on and I especially like how you draw the flowers and house in the first frame you shared.
Aside from the focal points in colours and vibrance that Shani mentioned I think, one improvement point I see throughout is your tangents. For example, in image #1, Theo's silhouette doesn't stand out very clearly from the background. If you lifted him a little to stand more clearly against the plain sky, I think that would help empathize him.
Similarly in image 2, because Theo and Chalkie are right in front of the elephant but have similar values, they don't stand out as very clear silhoeuttes. I think either they could stand not directly in front of the ele-lion, or their values need to be silhouetted more clearly. If that's what you want to go with, I'd also make sure that the left side of Theo's head isn't exactly on the line of the elephants leg. This makes the shapes blend together a bit!
In image 3 again, Theo's head is just about touching the elephan'ts silhouette, and I think this adds nothing to the frame. If you moved theo and the dog a little to the right, both parties would have a clearer silhouette going for them. You could do a lot with the composition here, like forming a triangle between the sun, theo-chalkie and the elephant for the eye to follow.
But yeah, all in all I'd say definitely look at your images in greyscale and check if the values read! I think in many cases you'll find it hard to tell the focal point from a distance.