https://www.elsevier.com/authors/journal-authors/graphical-abstract
y ahí tienen instrucciones y ejemplos. Las especificaciones de pixeles, fuentes son orientativas para nosotros.
A graphical abstract is a single, concise,
pictorial and visual summary of the main findings of the article. This
could either be the concluding figure from the article or a figure that
is specially designed for the purpose, which captures the content of the
article for readers at a single glance. Please see examples below.
The
graphical abstract will be displayed in online search result lists, the
online contents list and the online article, but will not (yet) appear
in the article PDF file or print.
Author instructions
A
graphical abstract should allow readers to quickly gain an
understanding of the main take-home message of the paper and is intended
to encourage browsing, promote interdisciplinary scholarship, and help
readers identify more quickly which papers are most relevant to their
research interests.
Authors must provide an image that clearly
represents the work described in the paper. A key figure from the
original paper, summarising the content can also be submitted as a
graphical abstract. Graphical abstracts should be submitted as a
separate file in the submission system by selecting “graphical
abstracts" from the drop-down list when uploading files.
Specifications:
A graphical abstract should be a one-image file and should visualize one process or make one point clear. For ease of browsing, the graphical abstract should have a clear start and end, preferably "reading" from top to bottom or left to right. Try to reduce distracting and cluttering elements as much as possible.