Concept illustrations for childrens books

I need approx. 10 illustrations completed to support children’s book concepting and ideation. Examples illustrations include: a dog, forest scene, cottage, beach scene, bubbles and a bus. Not looking for lots of details More so to achieve a style of illustration.
As it’s at concept stage only looking to agree a look and feel for one illustration then for this to be applied to the other 9. Photos can be provided to support illustrations and aside from illustrations needing to be in colour I’m flexible on illustration style. This could turn into a longer term brief/agreement however at this stage it’s just the 10 illustrations.