The problem is that you have to transfer the real motive only on a transparent film. This under the full-surface sheet produces a bump which has emerged easily. In addition, the black parts partially stick better on the carrier film, as on the banners - so always be careful to support the detachment of the black parts, be careful that no wrinkles, ...
Although the whole looks relatively good, but is miserable Thoughtfully. It would have been reasonable to print on the transparent cover sheet itself, at the point where the apple is a piece of the support film making to replace, so that one of the stickers in the right place fixed for now. The carrier film should be there then divided so that they then left and right moves, if you want to apply the sticker. So you can avoid wrinkles and bubbles, the sticker located at the end there where it should be, and the bubbling through the 2 Stickers layers is bypassed => beautiful, but not well thought out, a shame ... :(