P&B

Remove the thin black stroke. I would like to see the the gradient in a solid color like gray or black.

These close, not that it lacks... I think that ledge is so bright and the colors you use... also the typography of "publicidade y artes gráficas" distracted by the capital letters...

Seems a bit too loud. Yep, remove the strokes and 'bevel' effect. Go for a much cleaner look. I know this is for a graphic design agency but I'm sure, a simple and neat look will go a long way.

By the way, what does the 'b' stand for?

i don't think it looks bad, i think it's a little busy for something really simple. it's not bad though, try doing what the others above said as well just to test the water.

Loose all gradients

Work on Positioning

Colors dont work well together

Choose different fonts

Work on Scaling

Your "&" symbol needs to be worked in better

Regarding colors, I can not escape to the original colors of the company, since it is primary colors, magenta and cyan.
The first logo colors were not able.
I can not properly place the logo, which gives a distorted view of the proportions.

Hmmm... eu acho que a ideia é interessante, mas o efeito bevel (como aqui já foi dito não resulta. As cores são as cores do cliente então realmente nada há a fazer. O que eu sugeria seria brincar um pouco com as letras incluindo o &. Acho que você também esticou um pouco a font da frase em baixo... regra número 1 de um designer, NUNCA adulterar uma font rsrsrsr. Aposto que com mais algumas tentativas o resultado será otimo.